$\lim_{x\to1}\left(\sen\left(\frac{\pi}{x^{2}-1}\right)\right)$
$\left(x^2+1\right)\frac{dy}{dx}+3x^3y=6xe^{-\frac{3}{2}x^2}$
$\left(xy^4-5\right)^2$
$\frac{\tan\left(-x\right)+\cot\left(x\right)}{\tan\left(x\right)}=-\csc^2\left(x\right)$
$7x^2-9x+2=0$
$12-1600$
$\frac{\sin\:\left(x+h\right)-\sin\:\left(x\right)}{h}=\frac{2\sin\:\left(\frac{h}{2}\right)\cdot\:\cos\:\left(x+\frac{h}{2}\right)}{h}$
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