Estimate the value of \int^7_4\left(1+x^2\right)\sin x\:dx, make sure that your answer has 3 decimal places.

Answer 1

I'm guessing you meant

∫[4,7] (1+x^2) sinx dx

or something. Try reposting with better notation.

You can also use my notation above at wolframalpha.com to evaluate integrals.