Q. 30

# Mark the correct alternative in the following:If f(x) = sin [π2] x + sin [-π2] x, where [x] denotes the greatest integer less than or equal to x, thenA. f (π /2) = 1B. f(π) = 2C. f (π /4) = - 1D. None of these

[]=9 and [-]=-10

Now, f(x)=sin[π2 ] x + sin[-π2]x

=sin 9x-sin 10x

Now, checking values of f(x) at given points..

=1-0

=1

Option A is correct..

f(π)=sin 9π-sin 10π

=0-0

=0

Option B & C are incorrect..

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