Question

find the number of solutions for |cosx| = sinx

Answer 1

State the number of solutions of the equation cos(x) - sin(2x) = 1, for 0 ≤ x ≤ 2π.

cos(x) - sin(2x) = 1

=> cos(x)(1-2sin(x))=1



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Answer 2

as cos^2 thata+sin^2 theta=1

cosx=sinx=cos/sintheta

now you can solve it easily