$2a^2x+ax^2-3ax$
$\frac { x ^ { 4 } - 1 } { x + x ^ { 2 } }$
$12cos^2\left(x\right)-5sin\left(x\right)-10=0$
$\left(x+y\right)=\left(15.x\right)+\left(15.y\right)$
$18\cdot18$
$\lim_{x\to0}\left(\frac{cos\left(8x\right)}{x^2}-1\right)$
$\left(2x-3y^2\right)^3+\left(2x-3y^2\right)^2$
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