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I do not see that the standards require solving simple trigonometric equations like (sin x)^2 = 1/4 for 0 < x < 2pi Am I correct?
Solving this equation might be seen as a combination of:
F-TF.3 (+) Use special triangles to determine geometrically the values of sine, cosine, tangent for π/3, π/4 and π/6. . . .
and
F-TF.8 Prove the Pythagorean identity [sin(θ)]^2 + [cos(θ)]^2 = 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.
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