$\frac{cos\left(t\right)^2}{sin\left(t\right)}$

$\int\left(x^2-1\right)\sqrt{\left(2x-1\right)}dx$

$\lim_{x\to\infty}\left(1+\sin\left(4x\right)^{\cot\left(x\right)}\right)$

$x\left(\frac{3}{x}-3\right)$

$30\cdot\left(-23\right)+30\cdot14$

$36x^2+49x+72$

$\lim_{h\to0.1}\left(\sqrt{x+2}\right)$