**Find**

** Solution.** It is easy to see that
sine-substitution is the one to use. Set or
equivalently . Then which
gives us

Easy calculations give

Technique of integration of powers of trigonometric functions give

which suggests the substitution . Hence which implies

Therefore, we have

This will not answer fully the problem because the answer should be
given as a function of *x*. Since , we get after easy simplifications

**
**

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