$\left(\frac{2}{5}x^2-\frac{1}{2}y\right)^2$

$\int\left(x+1\right)\left(3-3x^2-6x\right)dx$

$\int ( 12 x ^ { 2 } + 4 ) ( 4 x ^ { 3 } + 4 x - 8 ) ^ { 3 } d x$

$sin^2x=\frac{sec^2x-1}{sec^2x}$

$9\left(x-y^2\right)+12\left(x-y\right)\left(x-y\right)+4\left(x+y\right)^2$

$9v+18$

$-3-\left(-1\right)$