$\cos\left(x\right)+\cos\left(x\right)\cdot\frac{\sin\left(x\right)^2}{\cos\left(x\right)^2}=\frac{1}{\cos\left(x\right)}$
$3x^3y-9x^3+11x^3y$
$\left(-7a^2+2\right)\left(7a^2-2\right)$
$\int\:\sin^4x\cos^3x\:dx$
$0t-9t+6u+4u^5$
$6^4-3b^3-10b^2$
$20a^3+25+4a^6$
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