Mapping \[f:R\to R\] which is defined as \[f(x)=\cos x,\ x\in R\] will be [UPSEAT 1999]

Mapping \[f:R\to R\] which is defined as \[f(x)=\cos x,\ x\in R\] will

1.	Mapping \[f:R\to R\] which is defined as \[f(x)=\cos x,\ x\in R\] will be [UPSEAT 1999]
A.	Neither one-one nor onto
B.	One-one
C.	Onto
D.	One-one onto
Answer» B. One-one

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Mapping \[f:R\to R\] which is defined as \[f(x)=\cos x,\ x\in R\] will be [UPSEAT 1999]

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