$\lim_{u\to0}\left(\left(\frac{\cot u}{\csc u}\right)\left(1+\frac{1}{\cot2}\right)^{\frac{1}{2u}}\right)$

$6-\frac{1}{2}\cdot12$

$\left(b\right)\left(10y-2x\right)^3$

$cos=0.4217$

$\int\left(2x\sin\left(y\right)\right)dx$

$\frac{x^3+3x^2-8x-16}{x+5}$

$\frac{49x^{10}y^{12}}{x^4y^2}$