$6\left(a^2+4\right)-3\left(a^2+1\right)$

$\lim_{x\to0}\left(\frac{\tan\left(nx\right)-n\tan\left(x\right)}{n\sin\left(x\right)-\sin\left(nx\right)}\right)$

$\frac{12x^4y^3}{4xy^2}$

$\frac{d}{dx}\left(\left(x+6\right)^5\left(2x-5\right)^4\right)$

$2\left(p+8\right)$

$\left(-90\right)-\left(-123\right)$

$\int\left(\frac{10-y}{2}\right)dy$