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Question

If f(x)=2[x]+cos([π]x), where [.] represents greatest integer function, then

A
f(π2)=3
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B
f(π)=0
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C
f(π4)=1
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D
f(π)=7
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Solution

The correct option is D f(π)=7
f(x)=2[x]+cos([π]x)
f(x)=2[x]+cos(4x)f(x)=2[x]+cos(4x)

Now,
f(π2)=2[π2]+cos(2π) =21+1=3

f(π)=2[π]+cos(4π) =23+1=7

f(π4)=2[π4]+cos(π) =201=1

f(π)=2[π]+cos(4π) =2(4)+1=7

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