$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)}{x^2-3x}\right)$
$\left(3x+4y\right)^3+\left(10x+8y^2\right)+5x+12y$
$x^2+10x=39$
$\left(a+4\right)^7$
$x^2+x-21$
$-0.23\cdot12^3+1.84\cdot12^2-20.71\cdot12+40$
$\int_0^{\sqrt{5}}\left(xe^{8-2x^2}-x\right)dx$
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