$tan\left(2x\right)=2sin\left(x\right)cos\left(t\right)sec\left(2x\right)$
$\lim_{x\to\infty}\left(\frac{3x^7-2x^2-5x}{3x^3-2x^2}\right)$
$x^6\:+\:2x^3y^2\:+\:y^4$
$\left(b+9\right)\left(-b+8\right)$
$-2u^2-8u^2$
$\left(\frac{1}{2}a+\frac{2}{3}b\right)^2$
$\frac{d}{dx}3x^2+2xy^2=y$
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