$x^8-2x^7-x^6$
$\lim_{x\to0}\left(\frac{\left(\frac{1}{3}\right)^x}{2x}\right)$
$x+9=18+-2x$
$2\sin^2\left(x\right)+cos^2\left(x\right)=2-cos^2\left(x\right)$
$-10+5-4y$
$\lim_{x\to1}\left(x-1\right)^{\ln\left(x\right)}$
$\frac{1+cotx+cscx}{1+tanx+secx}=cotx$
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