## lilg132 4 years ago intergrate want to check if the answer is right

1. lilg132

$\int\limits_{}^{}6.6\sin(3x) - 2.5\cos(0.5x)dx$

2. lilg132

answer ? ${-6.6 \over 3}\cos(3x) + {2.5 \over 0.5} \sin(0.5x) + c$

3. mathteacher1729

Looks good to me. You can always take the derivative of your answer and see if you get the expression inside the integral for problems like this, though. :)

4. lilg132

ok thanks alot mate :D

5. lilg132

because when i typed it in wolframalpa it gave me a completely different answer https://www.wolframalpha.com/input/?i=integrate+6.6sin%283x%29+-+2.5cos%280.5x%29dx