F.TF.C: Prove and apply trigonometric identities.

Prove and apply trigonometric identities.

F.TF.C.8Prove the Pythagorean identity sin^2(θ) + cos^2(θ) = 1 and use it to find sin(θ), cos(θ), or tan(θ) given sin(θ), cos(θ), or tan(θ) and the quadrant of the angle.F.TF.C.9.aUse trigonometric identities to rewrite expressions and as a tool when solving trigonometric equations.

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