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a
π
b
2π
c
π2
d
None of these
answer is C.
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Detailed Solution
let fx =cos sinx-cosx ⇒fπ2+x=cos sinπ2+x-cosπ2+x = coscosx--sinx = cos sinx-cosx since cos-x=cosx =fx period of f(x) = π2 since π2 is the least positive value satisfying the above condition.