$\sqrt[3]{8-1\cdot\sqrt[3]{8}+16^{2^{-2}}}$

$-16x^2-144$

$\frac{1}{2}\left(e^x\:sen\:x\:+\:e^x\:cos\:x\right)$

$4\cos^2\left(2\right)=5-\left(4\sin\left(2\right)\right)$

$sec\left(x\right)+\frac{sin\left(x\right)}{cos\left(x\right)}=\frac{cos\left(x\right)}{1-sin\left(x\right)}$

$\cot\left(x\right)-\tan\left(x\right)=\sin\left(2x\right)$

$18\cdot25$