$sin=90$

$\left(2x^2-3y+z\right)^2$

$\tan\left(\frac{x}{2}\right)=\frac{\tan\left(x\right)}{\sec\left(x\right)+1}$

$\left(tan\theta\:+1\right)\left(cos\theta\:+1\right)=0$

$\frac{2x^2+26x+80}{x^2-2x-35}$

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

$\int\frac{4e^{2x}+2e^x-1}{e^{3x}+e^{2x}}dx$