$\cos x=\sin2x$
$-2x^4x^3$
$\left(7^2-7^2\left(5x\right)\right)$
$\int5\cdot ln\left(x\right)dx$
$\int\left(\frac{a+bx^9}{\sqrt{10ax+bx^{10}}}\right)du$
$\int\:tan^39xdx$
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