$3\tan\left(2x\right)+\sin\left(2x\right)=0$
$\frac{d}{dx}\:x^4+4x^3y+y^4=20$
$\left(-4c+1\right)\left(4c+1\right)$
$\lim_{x\to0}\left(3x+cosx\right)^{\frac{1}{x}}$
$\lim_{x\to-\infty}\left(x+\sqrt{-x}\right)$
$\frac{d}{dx}x\sqrt{x^2+45}$
$-17x^2+22x^2$
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