$\cos\left(3x\right)=\left(1-4\sin^2\left(x\right)\right)\cos\left(x\right)$
$\left(-7x+5\right)+\left(-4x^2+7x-11\right)$
$\lim49\left(\frac{x-49}{\sqrt{x}-7}\right)$
$\frac{2i-1}{i\left(i+2\right)}$
$\left(x^3+y^3\right)\left(x^6+x^3y^3+y^6\right)$
$a+w=5a$
$31\int x^2\cdot\cos\left(x\right)dx$
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