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If [.] denotes the greatest integer function , and f(x)= cos [pi^2] x+cos [-pi^2] x , then f(pi/2) equals

Answers (1)

D Deependra Verma

Solution: $[pi^2]=9$ and $[-pi^2]=-10$

$f(x)=cos [pi^2]x+cos [-pi^2]x$

$Rightarrow$ $f(fracpi2)=-1$ .

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