$\left(3-4ab\right)\left(3+4ab\right)$
$\frac{\cot\left(x\right)+1}{\cot\left(x\right)}=1+\tan\left(x\right)$
$400-400\cdot 2.7183$
$\frac{d}{dx}y\:=\:ln\sqrt{\frac{x-1}{x+1}}$
$-960+275-306$
$\lim_{x\to0}\left(\frac{ax^2+bx^3}{cx^2-dx^3}\right)$
$10a+10a+6a-4a$
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