Posted by Debbie on Sunday, May 2, 2010 at 6:56pm.
Can someone please help me?
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 7:43pm
cos(2θ)
=cos²(θ)sin²(θ)
=(1sin²(θ))sin²(θ)]
=12sin²(θ)
Can you do the rest?