$\frac{\frac{1}{\sin\left(u\right)}}{\sec\left(u\right)}=\cot\left(u\right)$

$-2a\left(3a^4\right)$

$\lim_{x\to0}\left(\frac{\sin\left(5t\right)}{2t}\right)$

$\frac{-48}{2x^{5}-x^{6}+6\left(x-3\right)}$

$4,78-0,9+0,007$

$\log\left(16x+2\right)-\log\left(4x+2\right)=\log\left(2x+4\right)$

$\frac{\sin^2\left(x\right)+2\sin\left(x\right)+1}{\cos^2\left(x\right)}$