$\lim_{x\to45}\left(\frac{3-3\:\:\tan\left(x\right)}{\cos\left(x\right)-\sin\left(x\right)}\right)$

$3 \cdot 36 x ^ { 2 } - 84 x y + 49 y ^ { 2 }$

$2\left(4a+b\right)+3\left(a-3b\right)$

$12,67\:+23,0,178$

$\lim_{x\to0}\left(\frac{n\left(ln\left(n\right)\right)}{17n^2+4}\right)$

$\int36xe^{2x}dx$

$\left(\sqrt{a^3-b^3}+2\right)$