$\frac{dy}{dx}=\frac{sinx}{cosx}y=2cos^2\left(x\right)sinx-1$
$\lim_{x\to\infty}\frac{x}{x^2+6x}.\cos\left(x+5\right)$
$\frac{1}{\tan^2\left(a+1\right)}+\frac{1}{\cot2\left(a+1\right)}$
$\frac{dy}{dt}=3x-2y+5\sin\left(2t\right)$
$-110-30-50+0$
$\left(4xy+2x^3-2x\right)\left(x\right)$
$\left(3y-2\right)\left(5\right)$
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