$\int_0^{6seny}x^2seny\:\:dx$
$\int_0^{\infty}x^2e^{\frac{-x}{4}}dx$
$4\cdot x=28$
$\int_{-\infty}^0ae^{ax}dx$
$x^4-64$
$\left(2x^2y^4+6a^5b^3\right)\left(2x^2y^4-6a^5b^3\right)$
$\int\frac{2}{e^x+e^{-x}}dx$
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