# TRIG

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

sin θ = 12/13, cos θ > 0
Find cos (2θ).

1. 👍 0
2. 👎 0
3. 👁 86
1. cos(2θ)
=cos²(θ)-sin²(θ)
=(1-sin²(θ))-sin²(θ)]
=1-2sin²(θ)

Can you do the rest?

1. 👍 0
2. 👎 0
posted by MathMate

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