SOLUTION: Will someone please show me (with steps) how to evaluate the following integrals?
a) cos^3 x dx
b) x sin 11x dx
Any help would be great.
-Thanks.
Algebra.Com
Question 349323: Will someone please show me (with steps) how to evaluate the following integrals?
a) cos^3 x dx
b) x sin 11x dx
Any help would be great.
-Thanks.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Just use a table of integrals.
\,dx\ =\ \frac{3sin(ax)}{4a}\ +\ \frac{sin(3ax)}{12a}\ +\ C)
In your case, 
, so:
\,dx\ =\ \frac{3sin(x)}{4}\ +\ \frac{sin(3x)}{12}\ +\ C)
For the other one:
\,dx\ =\ \frac{x\cos(ax)}{a}\ +\ \frac{\sin(ax)}{a^2}\ +\ C)
Just fill in your value of 
John
My calculator said it, I believe it, that settles it
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