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HSF.TF.C.9 Tutor Intake — Angle Addition and Double Angle Formulas

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Grade 9·14 problems·~18 min·Common Core Math - HS Functions·group·hsf-tf-c-9

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Concepts

The double angle formula $\sin(2A) = 2\sin A \cos A$ is best described as:

A completely new identity that must be memorized independently

The addition formula for $\sin(A + B)$ with $B$ replaced by $A$

A consequence of the Pythagorean identity only

A definition of $\sin(2A)$ with no connection to $\sin(A + B)$