$2cos5xcos2x+2sin5xsin2x=-1$
$x^3y'-x^2-2=0$
$\left(-1-6m\right)^2$
$7x^2+3x-2=0$
$5x^2-50x+125$
$\left(+10\right)+\left(-16\right)-\left(+3\right)-\left(-20\right)$
$\cos^2\left(45\right)=\cos15\cos\left(30\right)-\sin\left(15\right)\sin\left(30\right)$
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