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Let [x] = the greatest integer less than...

Let `[x]` = the greatest integer less than or equal to x and let `f(x) = sinx + cosx`. Then the most general solutions of `f(x) = [f(pi/10)]` are :

A

`2npi +- pi/2,n in Z`

B

`npi,n in Z`

C

`2npi, n in Z`

D

None of these.

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The correct Answer is:
D
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