Before integrating

MATHEMATICS · Single correct · AP · Calculus AB · Integration and Accumulation of Change · Integration and Accumulation of Change

Problem

Before integrating, cos⁡23x\cos^2 3x is most conveniently rewritten as (a) 12(1+cos⁡3x)\tfrac12\bigl(1+\cos 3x\bigr) (b) 12(1+cos⁡6x)\tfrac12\bigl(1+\cos 6x\bigr) (c) 14(1+cos⁡6x)\tfrac14\bigl(1+\cos 6x\bigr) (d) 12(1−cos⁡6x)\tfrac12\bigl(1-\cos 6x\bigr)

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