$\left(secx.cscx-cotx\right)cosx$
$x^3+2bx^2$
$12x^2-9x=0$
$\lim_{x\to\frac{1}{2}}\left(17y^2-4\right)^4$
$3x+2x-x+2x$
$25x^2+30x+4$
$\lim_{x\to+\infty}\frac{2\sqrt{x}}{\sqrt{x}-1}$
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