$\lim_{x\to\infty}\left(\frac{\sin\left(\sqrt{x^2+1}\right)}{x}\right)$
$3x^2-15x+7=0$
$\lim_{x\to6}\left(\frac{10\left(x-6\right)}{x^2-2x-24}\right)$
$\left(2y+3x^4\right)\left(-2y+3x^4\right)$
$y'=\left(-2x+5\right)\left(7y+2\right)$
$\left(x^3+3x^2+y^3=8\right)$
$\frac{sen\:x}{csc\:x}\:+\:cos\:$
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