$cos\left(sen^1\left(x\right)\right)$

$32y\:+\:21y$

$2\left(2\sin\left(x\right)^2+1\right)$

$\lim_{x\to\infty}\left(\frac{cos\left(3x\right)}{3x}\right)$

$\left(3a^4b^5\right)^3$

$-288:\left(-24\right)$

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