Solution assignment 22 Differentiation of standard functions

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Assignment 22

Differentiate:

y=2\sin(\frac{1}{2}x)\cos(\frac{1}{2}x)

Solution

It is difficult to differentiate this function. It is not in the list of standard functions. Furthermore, there is a product of two trigonometric functions and we do not know how to differentiate this. Finally, the trigonometric functions have an argument \frac{1}{2}x.
Yet is appears quite simple to differentiate this function by applying one of the so-called double-angle formulas, i.e. by applying the trigonometric formula:

\sin(x)=2\sin(\frac{1}{2}x)\cos(\frac{1}{2}x)

So the original function becomes:

y=\sin(x)

which is quite easy to differentiate:

y'=\cos(x)

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