Midcontinent Research for Education and Learning
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Reference
Common Core Mathematics 912
Cluster
Prove and apply trigonometric identities
Grade 912
F.TF.8.
Prove 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.9.
(+) Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.