$\frac{sinxcotx}{cosx}$
$9a^2-25m^2$
$9u^2+24uv+16v^2$
$\frac{36}{3x^2}$
$-\left(xy\right)dx+\left(x^2-xy+y^2\right)dy=0$
$-x^2\ge-2x-3$
$u=\left[\left(y-1\right)\left(2y+3\right)+7\right]^{\left(5\right)}$
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