$4\left(1\right)^4-8\left(1\right)^3+14\left(1\right)^2+8\left(1\right)-15\:\:\:\:\:\:\:$

$2800\cdot27$

$2x^2+4x-\frac{2}{2}$

$\lim_{x\to\infty}\left(\frac{e^x-x-1}{cos\left(2x\right)-1}\right)$

$1.4-2.7a+8.1a-a-6.4a$

$\int x\cdot\cos\left(3x\right)\sin\left(3x\right)dx$

$\int\frac{x-1}{\left(x^2-5x+6\right)}dx$