Find the function

The purple curve is sin(X)
The grey curve is a mystery
The blue curve is f(x)
The red curve is f(sin(x))

Can you alter the definition of f(x) so that the red curve lies on top of the grey curve?

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Use the pow function instead of ^.
So x squared should be written pow(x,2)
The square root of x can be written sqrt(x) or pow(x,0.5)

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