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Evaluate the expression under the given conditions.

0 votes

cos(2θ); sin(θ) =

-5
13

θ in Quadrant III

asked Mar 17, 2017 in TRIGONOMETRY by anonymous

1 Answer

0 votes

The trigonometric identity is image

Consider the right angle triangle, then image

Find image

image

image

answered Mar 17, 2017 by Anney Mentor

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