$\left(2y+3z\right)+\left(5y-6z\right)+\left(4y-z\right)$

$\left(\sqrt{x}-2\right)^5$

$\sec\left(x\right)^2+\csc\left(x\right)^2=\cos^2\left(x\right).\csc^2\left(x\right)$

$\lim_{x\to infinity}\left(xln\left(1+\frac{1}{x}\right)\right)$

$16+4x^6$

$2ab\cdot3c$

$\int\cos\left(x\right)\sin\left(y\right)dx$