$\frac{2\sin^2\left(x\right)-1}{\sin\left(x\right)+\cos\left(x\right)}=-\sin\left(x\right)+\cos\left(x\right)$
$x^3\cdot x^7\cdot x^0$
$5.5r+3.2r$
$6a\cdot\frac{1}{3}b$
$-25\:-\left(-10\right)$
$x\frac{dy}{dx}-y=2x^3y$
$x^2+18x+6$
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