$t^4+3t^2-2$
$\lim_{x\to-\infty}\left(\left(6-x\right)e^{\frac{x-4}{3}}-1\right)$
$\lim_{x\to1}\left(\frac{x^2+2x}{e^{3x}-1}\right)$
$9-6x+x^2.x^2-5x+6$
$\frac{dy}{dx}=\frac{-x+2y}{4x+y}$
$\cos\left(2\right)x+\sin\left(2\right)x=1$
$\frac{3x^4+7x^3+11x-11}{x}$
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