$\cos\left(x\right)^2\csc\left(x\right)+\sin\left(x\right)$
$8a^4+0a^3-6a^2+0a-9$
$\left(2x^4-y^4\right)^2$
$\left(7-c\right)\left(7+c\right)$
$\left(3x-7y\right)^2$
$\frac{x^3+4x^2-5x^1+8}{x^2-2x+1}$
$6cos^2x-3cosx-3=0$
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