$x^4+x^3-19x^2-49x-30$
$\frac{1+sin\left(2x\right)+cos\left(2x\right)}{2sinx\left(sinx+cosx\right)}=cotx$
$\left(6x^2+5x+6\right)$
$\frac{2x}{\sqrt{3x-1}}$
$\lim_{t\to1}\left(\frac{t^3-2t+1}{t^3+t^2\:+2}\right)$
$\sin\left(\frac{2}{x}\right)'$
$5t^4y+3t-10t^2$
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