\(y^`=\dfrac{\left(1+sinx\right)^`\left(2-sinx\right)-\left(1+sinx\right)\left(2-sinx\right)^`}{\left(2-sinx\right)^2}\)
\(y^`=\dfrac{cosx\left(2-sinx\right)+\left(1-sinx\right)cosx}{\left(2-sinx\right)^2}\)
\(y^`=\dfrac{cosx\left(2-sinx+1-sinx\right)}{\left(2-sinx\right)^2}\)
\(y^`=\dfrac{cosx\left(3-2sinx\right)}{\left(2-sinx\right)^2}\)

