$\sqrt{2}\csc\left(2x\right)+2=0$
$\left(a-9\right)\left(a+7\right)$
$\int\left(x-4\right)sen\left(4-x\right)dx$
$20+90+51e$
$\frac{5m}{\sin\left(30\right)}$
$\frac{d}{dx}t^4-18t^3+25$
$\left(-x^4+\frac{1}{2}x^2+x-\frac{7}{2}\right)-\left(4x^3-2x^2-5\right)$
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