$cos\left(x\right)\:tan\left(x\right)+\:sin\left(x\right)\:cot\left(x\right)=\:sin\left(x\right)\:+\:cos^2\left(x\right)$
$\left(xy\right)^{-2}\left(x^3y^{-8}\right)$
$\left(y^3-7\right)\left(-8+3y^3\right)$
$-2x^2+5\cdot2x-1$
$4+16x^2$
$x^2-4\:=\:-2$
$8x-7y+3xyz-7x+8y-xyz$
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