$cos2xcsc^2x-csc^2x=-2$
$\frac{8\sqrt{x^7}-6\sqrt{x^5}}{2\sqrt{x^3}}$
$\lim_{x\to\infty}\left(\frac{4x^2-5x-2}{\sqrt{x^4+3x+2}}\right)$
$225a^6-81b^4$
$6x^2-10-11x=0$
$6x\:-\:45\:\le\:15x\:-\:12\:$
$3y=y$
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