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Let f: Rvec, where f(x)=sinx , Show that...

Let `f: Rvec,` where `f(x)=sinx ,` Show that f is into.

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`f:R to R, f(x) =sinx`
Range of the function is `[-1,1],` which is subset of codomain R.
So, `f(x)` is into.
To make `f(x)` onto, we modify the codomain to `[-1,1].`
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