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Posted by 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 - , Sunday, May 2, 2010 at 7:43pm

    cos(2θ)
    =cos²(θ)-sin²(θ)
    =(1-sin²(θ))-sin²(θ)]
    =1-2sin²(θ)

    Can you do the rest?

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