$\frac{3-3\cos\left(x\right)}{5\sin\left(x\right)}$
$72\cdot45$
$90^4$
$3\cdot\left(x^2+4\right)\cdot\left(x-1\right)\cdot\left(x^2+2x+1\right)$
$2300+-1500$
$6\:-\:n\:-\:11$
$\left(x+1\right)=x^2-1$
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