$8x-x-6$
$\left(x^5+3x^4-7x^3+2x^2+8x-1\right)-\left(x+1\right)$
$3x+2x-x+2x^2$
$\left(8x^5+4y^7\right)^2$
$\frac{\csc^2\alpha}{\tan^2\alpha}$
$5\cos^2=4-3\sin^2$
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