$\cos\left(2x\right)\cdot\cos\left(x\right)-\sin\left(x\right)\sin\left(2x\right)$
$15x^2-75x+90$
$\frac{3\cdot\left(xy^2+3xy+y^3-y^2\right)}{x+y\cdot y^2}$
$\left(10+125+648-57\right)\cdot10$
$-1\cdot2x-1$
$-5-9-\left(-6\right)+\left(-2\right)+12$
$7\:\:\:-5\:\:\:\:\:\:\:10$
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