$\lim_{x\to0}\left(\frac{e^x-e^{-x}-2sin\left(x\right)}{4x^2}\right)$

$2\cdot5^{x-4}+15=265$

$\int3e^{-2x}\sin\left(6x\right)dx$

$\int\frac{5x^3-4x^2+9}{x^2}dx$

$120\cdot3$

$\sin\left(-\frac{12}{\frac{13}{2}}\right)+5\cos\left(-\frac{12}{\frac{13}{2}}\right)$

$4c^8-48c^4+144$