$\left(u^2+3\right)\left(u^2-5\right)$
$\left(-1\right)^n\cdot\frac{x^n}{n+1}$
$6235-5624$
$\cot\left(x\right)^2\sin\left(x\right)^2+\sin\left(x\right)^2-\cos\left(x\right)^2=\sin\left(x\right)^2$
$x=3\sqrt{8-y}$
$k^3=27$
$\left(7x^5y^2-3x^7y^3\right)^4$
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