$\sqrt{\sin^2\left(x\right)}+\cos^2\left(x\right)$

$\frac{x^2+4x-21}{x^2+8x+15}$

$\frac{\tan\left(x\right)}{\sin\left(x\right)}+\frac{\csc\left(x\right)}{\tan\left(x\right)}=\csc^2x\cdot\sec\left(x\right)$

$\int\left(15sin^2x\cdot cos^2x\right)dx$

$3t\:+\:9\left(4t\:+\:6\right)$

$\lim_{x\to-\frac{\pi}{2}}\left(\frac{\sin\left(x+\frac{\pi}{2}\right)}{\sin\left(x-\frac{\pi}{2}\right)}\right)$

$\tan\left(x\right)=\frac{15}{8}$