$\int\frac{e^{4x}}{\left(e^{2x}+1\right)^2}dx$
$14\cdot2700$
$3-4sin^2x+3cosx=0$
$7y^2-2y-5$
$y+\left(2x-y\right)-3y$
$\int\:\frac{\left(3x-5\right)}{\left(x-1\right)\left(x^2-1\right)}dx$
$\lim_{x\to1}\left(\tan\frac{\pi x}{4}\right)^{\tan\frac{\pi x}{2}}$
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