AP

MATHEMATICS · Single correct · AP · AP Precalculus · Trigonometric and Polar Functions · Trigonometric and Polar Functions

Problem

If cos⁡(2sin⁡−1x)=19\cos(2\sin^{-1}x)=\frac19, then x=x= (a) Only 23\frac23 (b) Only −23-\frac23 (c) 23,−23\frac23,-\frac23 (d) Neither 23\frac23 nor −23-\frac23

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