$\frac{2}{1-\sin x}+\frac{2}{1+\sin x}=4\sec^2x$
$\frac{dy}{dt}=1-t+4y$
$2y^3+4y^2+3y\cdot2$
$-16x^2-2x+0$
$\left(4a-3b\right)\left(4a-3b\right)$
$-4a+\frac{1}{2}a$
$\lim_{x\to-1}x^2-1$
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