SOLUTION: Find sin2x, cos2x, and tan2x if cosx= -15/17 and x terminates in quadrant III

Question 995648: Find sin2x, cos2x, and tan2x if cosx= -15/17 and x terminates in quadrant III
Answer by ikleyn(52799)   (Show Source): You can put this solution on YOUR website!
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Find sin2x, cos2x, and tan2x if cosx= -15/17 and x terminates in quadrant III.
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sin(x) = = = = = = (-8/17).

The sign is "minus" because the angle is in the quadrant III.

Now, sin(2x) = 2*sin(x)*cos(x) = .. = (*)     (calculate yourself).

cos(2x) = = (**)     (calculate yourself using (*)).

tan(2x) = = calculate yourself using (*) and (**).

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