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

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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

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

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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: