$7x-3y+7y-5x+8x$
$51=3k$
$\int-\frac{5}{8t\sqrt{64t^2-81}}dt$
$\int7\sin^4\left(x\right)\cos^4\left(x\right)\:dx$
$\int\frac{1}{x^3-x^2-2x}dx$
$\lim_{x\to\infty}\left(1+\frac{2}{x}\right)^{4x}$
$4^2-\left(-2\right)^2$
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