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Consider the function f(x)=xcosx-sinxdot...

Consider the function `f(x)=xcosx-sinxdot` Then identify the statement which is correct.
`a) f` is neither odd nor even.
`b) f` is monotonic decreasing at `x=0`
`c) f` has a maxima at `x=pi`
`d) f` has a minima at `x=-pi`

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