$40a-81a+130a+41a-83a-81a+16a$

$\lim_{x\to0}\left(\frac{\sin\left(3x\right)}{x-\cos\left(4x\right)}\right)$

$\frac{1}{2}\log_b\left(a\right)-2\log_b\left(5\right)-3\log_b\left(x\right)$

$\sqrt[7]{3x^5y^6}$

$\csc\left(x+30\right)=2$

$4y+3y+3x-6y-10-2$

$\left(a+b\right)\left(a+c\right)\left(b+c\right)$