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Question

If f:[0,Π][1,1], f(x) = cosx, then f is.

A
one-one
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B
onto
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C
one-one onto
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D
none of these
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Solution

The correct option is D one-one onto
f takes all values from [1,1] while travelling from [0,π]. None of the values are repeated either.

Hence it is one-one and onto.

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