$\left(\frac{1}{\cos\theta}-\tan\theta\right)^{2}=\frac{1-\sin\theta}{1+\sin\theta}$
$\frac{dy}{dx}-2x^2=-x$
$2574,458+147,367+0,468$
$\left\{39-\left[27-42-\left(19-35\right)+18\right]-37\right\}+8\:$
$2.72\cdot30$
$-9y-14=76$
$4^2+2\left(4^2\right)$
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