# Chk Anwser to evaluate integral Problem

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• August 25th 2006, 04:13 PM
Yogi_Bear_79
Chk Anwser to evaluate integral Problems
Evaluate $\int \frac{x^3+4}{x^2} dx$

$\int(\frac{x^3+4}{x^2})dx = \frac{x^2}{2}-\frac{4}{x}+C$

Evaluate $\int 2cos^2x dx$

$\int 2cos^2x dx = x + cos(x)sin(x)$
• August 25th 2006, 04:43 PM
topsquark
Quote:

Originally Posted by Yogi_Bear_79
Evaluate $\int \frac{x^3+4}{x^2} dx$

$\int(\frac{x^3+4}{x^2})dx = \frac{x^2}{2}-\frac{4}{x}+C$

Evaluate $\int 2cos^2x dx$

$\int 2cos^2x dx = x + cos(x)sin(x)$

You can always check these by taking the derivative of your answer.

Both of these are correct. (With the comment that you need a constant of integration in your second answer.)

-Dan