$6x\ge12+9x$
$75\cdot3$
$\int\frac{x}{2x^{2}+x-1}dx$
$\sin^{4}x-2\sin^{2}x+1=\cos^{4}x$
$\lim_{x\to-1}\frac{1}{2x+2}$
$a^2+9a-36$
$cotx\left(sin2x\right)=1\:+\:cos2x$
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