$2cos^2\left(2x\right)-1=cos\left(4x\right)$
$x^2dx+2ydy=0$
$\left(3+x\right)\left(3+2x\right)+\left(5+2x\right)\left(5-3x\right)+\left(3x-7\right)\left(2x+5\right)$
$\frac{3y}{2y+2}-y+\frac{y+2}{2y+2}$
$\int_{-3}^3\left(\frac{1}{x^2+3}\right)dx$
$log\left(15\right)+3log\left(x\right)-log\left(3\right)=log\left(5x^3\right)$
$\int\frac{\sin\left(e^x\right)e^x}{\cos\left(e^x\right)}dx$
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