$x=4x+15$
$-16\left(4\left(-8.2+4\left(5\right)-3+16\left(2.8\right)-4\right)\right)$
$\frac{9x^3-12x^4+21x^2+3}{3x}$
$-101-447$
$\int\left(sin\left(4x\right)cos\left(4x\right)\right)dx$
$\sin\left(x\right)=\frac{1}{2}\sec\left(x\right)\sin\left(2x\right)$
$\lim_{x\to2}\left(\frac{x+\sin\left(2x\right)}{x-\sin\left(2x\right)}\right)$
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