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April 21, 2015

April 21, 2015

Posted by **Debbie** on Sunday, May 2, 2010 at 6:56pm.

Use identities to find the indicated value for each angle measure.

sin θ = 12/13, cos θ > 0

Find cos (2θ).

- TRIG -
**MathMate**, Sunday, May 2, 2010 at 7:43pmcos(2θ)

=cos²(θ)-sin²(θ)

=(1-sin²(θ))-sin²(θ)]

=1-2sin²(θ)

Can you do the rest?

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