$\int_{\frac{\pi}{2}}^{\frac{3\pi}{2}}\left(cosx\right)dx$
$y'=9x^2-6$
$2x^2+6x-7>0$
$\int_{-\frac{\pi\:}{2}}^{\frac{\pi\:}{2}}cos^3\:x\:dx$
$x^2+2x+1<0$
$\int\:2xsec^2xdx$
$\frac{8x^4}{2x}$
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