$\sec\left(y\right)\csc\left(y\right)-\cot\left(y\right)$

$6\left(\frac{b}{b+1}\right)^2+5\left(\frac{b}{b+1}\right)-6=0$

$y=\frac{x^{4}\sqrt[6]{x^{3}+1}}{x^{2}-1}$

$y^{'\:}=8x^7$

$15x^3-11x^2+10x+\frac{18}{3x+2}$

$\left(x+4\right)\cdot\:\left(2y+6\right)dy+xy^2dx=0$

$x-3y=4$