Saturday, June 17, 2017

Evaluate the integral


Express the integrand in factor form.



Plug-in the trigonometric identity to one of the factors.





Plug-in again the trigonometric identity   to the second integral.




...


Express the integrand in factor form.



Plug-in the trigonometric identity to one of the factors.





Plug-in again the trigonometric identity   to the second integral.




For the first integral, apply the u-substitution method.


     


     


>>


For the second integral, apply the formula .


>>


And for the third integral, apply the formula .



So the integral becomes:







Therefore,    .

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