$x^7+2^7$
$\frac{\left(n+4\right)\left(x-3\right)^n}{n^2+5n-2}$
$\frac{4x^2-8x^2}{2x}$
$\frac{2x^4-2x^3+4x^2-5}{x+2}$
$-\sin\left(2x\right)+1\:=222$
$cosx=30^{\circ}$
$\sqrt{7y^{2}-49}{7y}$
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