$\lim_{x\to0}\left(\frac{\cos\left(\pi.x\right).\pi}{x}\right)$

$3x\left(x-9\right)-2\left(x-9\right)$

$5\cdot\left(7\right)^4+30\cdot\left(7\right)^3-40\cdot\left(7\right)^2+36\cdot\left(7\right)+14$

$3x-4+-8x+6$

$\lim_{n\to\infty}\left(\frac{\log\left(10\right)\left(2^n+1\right)}{n+1}\right)$

$\int\left(2x+1\right)\left(x-5\right)^{12}dx$

$\log\frac{6x}{x^2-3}$