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Official 2018 Paper 2 · Q4

Paper 2TrigonometryFunctions & graphsAlgebra

The non-zero real number cc is such that the equation cos⁡x=c\cos x=c has two solutions for 0<x<32π0<x<\frac32\pi.

How many solutions of the equation cos⁡22x=c2\cos^2 2x=c^2 are there in the range 0<x<32π0<x<\frac32\pi?

A22
B33
C44
D66
E77
F88

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