Simplify the expression $\frac{3\cdot 2\left(\frac{1+\sin\left(x\right)}{1-\sin\left(x\right)}\right)^2\cos\left(x\right)}{1-\sin\left(x\right)^2}$

$derivdef\left(\ln\left(x\right)\right)$

$derivdef\left(x\right)$

$derivdef\left(x<y<0\right)$

$derivdef\left(\cos\left(x\right)-\cos\left(x\right)\right)$

$\left(\frac{4}{3} x^2 y^3\right)^3\left(\frac{3}{16x^5}\right)^2$

$\left(\frac{x^{\left(-1\right)\cdot\frac{1}{2}}}{x^{\frac{3}{2}}}\right)^{\frac{2}{5}}$

$\sqrt{\frac{x^3-y^3}{x+y}\cdot\frac{x^2+2x\cdot y+y^2}{x^2+xy+y^2}}\frac{x^2-y^2}{4}$