$\left(-15\cdot8+\right)\left(-15\cdot4\right)$
$\sin\left(2x\right)=2\cot x\sin^2x$
$\frac{d}{dx}2x^2-xy+y^2=3$
$3x^2-5x+2x$
$7,5-0,75+2,015$
$\left(x-\pi\right)cscx$
$53\cdot58$
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