$\left(5x-2y\right)^{2}-4\left(5x+2y\right)\left(5x-2y\right)$

$3\sin\left(y\right)-4\sin^3\left(y\right)=\sin3\left(y\right)$

$\sec\left(x\right)^2+\csc\left(x\right)^2-1=\csc\left(x\right)^2$

$\frac{d}{dx}\left(\frac{\left(x^2+1\right)^3\left(2x+3\right)}{\sqrt{x+5}}\right)$

$\int\:\frac{1}{2}\left(1+cosx\right)^2dx$

$y-2^3$

$3x^2-3x+2$