# If cos A = -4/5 for angle A in Quadrant II, find sin 2A.?

In quadrant II only the sine and its reciprocal are positive. ... [ \cos^2A+\sin^2A = 1 \] ... Find the reference angle of each of the following angles: \ ... - Read more

is in Quadrant II, find the values of the other 5 trig. functions. 6. ... Find the missing arc length, central angle, ... a. sin 2A b. cos 2A c. tan2A 5. - Read more

## If cos A = -4/5 for angle A in Quadrant II, find sin 2A.? resources

### Math 1303 - March 6, 2002 - Week 8, day 2, Exam II on Day ...

Use the double angle identity cos 2A ... sin B = 12/13 with B not in quadrant I. Find . a) sin 2A ... B not in Quadrant II and cos B ...

### Double-angle and half-angle identities [Archive] - Free ...

In each case find sinx ... 1/4 and 90*

### Double Angle and Half Angle Formulas (Trig without Tears ...

... something like sin(2A) or cos ... a Double Angle. With equation 48, you can find sin ... the angle is in Quadrant II (above the axis). To find cos ...

### Trig. If sec(t)=-5 and the terminal point for t is in ...

trig November 25, 2012. use the formula for sin 1/2 theta to show that sin45 = sqrt2/2 if sin theta+ 0.6 and theta lies in quadrant 2 find cos theta/2 if ...

### Double-Angle and Half-Angle Identities - public.asu.edu

Double-Angle Identities sin(2a ) 2 sin(a ) cos( a ) cos(2a ... 3 Thus we see that the angle t/2 is in quadrant II. 2 2 4 ...

### Half-Angle Identities - Nova Scotia Department of Education

... 1. Sin(2A) = 2sinAcosA . 2. cos(2A) = Cos2A ... in the proof above only begin with Double angle Identity 4: Cos(2A) = 1 ... this quadrant. IV S A І. III T C II.

### PowerPoint Presentation - Career Launcher

... themselves * Ask the students to find the expressions for Sin ( A+B+C) and Cos ... tan(2A + A) Þ tan3A = Þ ... angle Obtuse Angle Quadrants O Y Y’ X’ X II ...

### PowerPoint Presentation - Seminole State College

Solution To find sin 2 , we must find sin ... Apply sin 2A = 2 sin A cos A directly. 9.3 ... Solution The half-angle terminates in quadrant II since 9.3 ...

### Cos/Sin/Tan - sin(α)=15/17, α lies in quadrant I, and ...

... and sin(β)=40/41, β lies in quadrant II. 1. cos(α+β)=? 2. sin (&alpha ... find: sin(A) sin(2A) tan ... Identify the quadrant for angle A under ...

### Using Fundamental Identities

Example: If and Өis in quadrant II, find each function value. a) sec Ө. To find the value of this function, look for an identity that relates tangent and ...

### MAT 126: Trigonometry - Indiana University Southeast

4 B is in quadrant II ... sin B = _____ (c) cos A = _____ (d) ... cos (A + B)= (j) sin 2A = (k) tan A/ 2 2. Convert the following:

### Verifying Trig Identities 1 – 2cos^2 X = Tan^2 X – 1 ...

EvenOdd (Negative Angle) Identities. sin(x) ... sin 2a = 2sina cosa. cos 2a = cos2a sin2a = 1 2sin2a ... If cos x = . 2. 3 and x is in quadrant II, find sin xcos x ...

### 1.What is the solution set for in the interval A) {30 ...

and lies in Quadrant II, what is ? 17.If ... 18.If sin A = , find cos 2A. ... 20.If x is a positive acute angle and sin x = , find cos ...

### Half and Double Angle Formulas - AlgebraLab

A quadrant four angle A has a ... To find the sin(2A) we use the double angle ... Find the and the for the angle in example (ii). To find the we use the half ...

### PowerPoint Presentation - Newmarket High School

... sin 2A = 2 sin A cos A (ii) cos 2A = cos2 A ... x) = 0.8 = cos x Soln : E.g. 2: If sin x = 0.6, cos x = 0.8, find (a) sin ... or 3rd quadrant Basic angle, ...

### Jiskha Homework Help - Math

135 is in quadrant II, so cos 135 = -sin 45 = -1/√2 ... cos 2A = 1 - 2sin^2 A -1 and ... Math-Trigonometry - Use the half-angle formulas to find the exact values ...

### Answer on Trigonometry Question for Muammar Mubin. Q&A 14778

Given that cos a 12/3 and a is an angle in Quadrant II and that sin Beta ... sin(B-C/2)=(B-C)/a *cos(A/2) 5. find the value of A .if i.(cosec 2A-2)(cot 3A-1)=0 ii.cos ...

### REFERENCE ANGLE CHART

Angle and whose angle a quadrant reference nov ... angle essential ii 30o. Three, find 214 that hand sin, at cos. ... angle to then the 1 a resource great to 2 2a.

### Section 7.2 - The Inverse Trigonometric Functions

Ex. 1a cos(sin – 1(3 2)) ... Ex. 2a csc – 1 ... we need to remember that the angle needs to be in quadrant II instead of quadrant IV.

### My Additional Mathematics Modules - Form 5 - Trigonometric ...

... (ii) cos θ = sin ... θ AND ITS ACUTE ANGLES Quadrant II Quadrant I Sine positive All positive (180o ... Given cos 2A = and A is an acute angle.

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... the point M moves to the first quadrant where its ... any trigonometric function of any angle. Example: Find the values of sin ... sin 2A = 2(sin A cos A ...

### Test Review - Pre-Calculus Name 1.) KNOW THE TRIG VALUES ...

... Find the reference angle: a) ... sin 6 h) 5π cos 4 i) 5 ... Name a quadrant II angle with reference angle of 50°. Review

### Name - Penditamuda's Blog

... in quadrant II = OP = sin = ... Find reference angle Solve sin 210 = sin 30 = 1 2 ... cos 51 = 0.6293 5.2.4 2a.

### Theory of Trigonometry - Scribd

... sum 180º The angle from Quadrant II could create ... versa: sin(A .tanAtanB To find sin ... A + cos A sin A so: sin 2A = 2 sin A cos A ...

### Trigonometry Ppt Presentation - authorSTREAM

... In the third quadrant, sin is negative cos is ... In the 3rd quadrant sine is negative – Find the angle to nearest x ... cos 2A = cos2A – sin2A ...

### Using Fundamental Identities - Tacoma Public Schools

... If and Ө is in quadrant II, find each function ... Negative-Angle Identities. 2. Use the values cos x > 0 and identities to ... cot x cos x + sin ...

### Section 6.3 – Properties of Trigonometric Functions

... (quadrant II and ... Ex. 2a sin(θ) < 0, cos(θ) > 0 ... Given One of the Functions and the Quadrant of the Angle. Given the following information, find the ...

### Trigonometry | S-cool, the revision website

... the point M moves to the first quadrant where its ... any trigonometric function of any angle. Example: Find the values of sin ... sin 2A = 2(sin A cos A ...

### MATH 1112 - Valdosta State University

... cos 2A . 2. (sin x/2 + cos x/2) 2 = 1 + sin x . 3. 4. II. Evaluate each using the ... If sin A = 5/13 and p /2 < A < p, find a) sin 2A and b) cos 2A. ANSWERS: II.

### Double-angle and half-angle identities - FreeMathHelp.com

In each case find sinx ... 1/4 and 90*

### Trigonometry Assistance - Math Help Forum

and A is in the 3rd quadrant, find exact values of: (i) cos A (ii) tan A (iii) sin 2A I guess im sort of confused what is being asked, the way I attempted it was:

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