$2cos^2+cosb=0$
$1+\frac{1}{y}=x^{-1}e^c$
$10+-5+-8+3+-4+7$
$x\frac{dy}{dx}=y\left(y+1\right)$
$\left(\frac{u^{-3}v^4}{u^{-3}v^3\cdot u^4v^{-2}}\right)^{-1}$
$a^2+9a-10$
$\frac{105}{15}$
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