$\frac{\sin\left(y\right)}{\csc\left(y\right)}+\frac{\cos\left(y\right)}{\sec\left(y\right)}$

$16^2x-25$

$\frac{\tan\left(3x\right)}{\cos^3\left(3x\right)}$

$\:\frac{d}{dx}\left[\left(y^2+3\right)^4-1\right]^3$

$3x^2-8x+5+8x^2+2x-10$

$\lim_{x\to\infty}\left(\frac{sin\left(\frac{3}{x}\right)}{x^2-x}\right)$

$5xtxt2$