Find the derivative of LaTeX: \displaystyle y = \frac{\left(1 - x\right)^{4} e^{x} \sin^{8}{\left(x \right)} \cos^{2}{\left(x \right)}}{\left(- 8 x - 9\right)^{8} \left(7 x + 3\right)^{8} \sqrt{\left(6 x + 5\right)^{7}}}

Taking the natural logarithm of both sides of the equation and expanding the right hand side gives: LaTeX: \ln(y) = \ln{\left(\frac{\left(1 - x\right)^{4} e^{x} \sin^{8}{\left(x \right)} \cos^{2}{\left(x \right)}}{\left(- 8 x - 9\right)^{8} \left(7 x + 3\right)^{8} \sqrt{\left(6 x + 5\right)^{7}}} \right)} Expanding the right hand side using the product and quotient properties of logarithms gives: LaTeX: \ln(y) = x + 4 \ln{\left(1 - x \right)} + 8 \ln{\left(\sin{\left(x \right)} \right)} + 2 \ln{\left(\cos{\left(x \right)} \right)}- 8 \ln{\left(- 8 x - 9 \right)} - \frac{7 \ln{\left(6 x + 5 \right)}}{2} - 8 \ln{\left(7 x + 3 \right)} Taking the derivative on both sides of the equation yields: LaTeX: \frac{y'}{y} = - \frac{2 \sin{\left(x \right)}}{\cos{\left(x \right)}} + 1 + \frac{8 \cos{\left(x \right)}}{\sin{\left(x \right)}} - \frac{56}{7 x + 3} - \frac{21}{6 x + 5} + \frac{64}{- 8 x - 9} - \frac{4}{1 - x} Solving for LaTeX: \displaystyle y' and substituting out y using the original equation gives LaTeX: y' = \left(- \frac{2 \sin{\left(x \right)}}{\cos{\left(x \right)}} + 1 + \frac{8 \cos{\left(x \right)}}{\sin{\left(x \right)}} - \frac{56}{7 x + 3} - \frac{21}{6 x + 5} + \frac{64}{- 8 x - 9} - \frac{4}{1 - x}\right)\left(\frac{\left(1 - x\right)^{4} e^{x} \sin^{8}{\left(x \right)} \cos^{2}{\left(x \right)}}{\left(- 8 x - 9\right)^{8} \left(7 x + 3\right)^{8} \sqrt{\left(6 x + 5\right)^{7}}} \right) Using some Trigonometric identities to simplify gives LaTeX: y' = \left(- 2 \tan{\left(x \right)} + 1 + \frac{8}{\tan{\left(x \right)}} - \frac{4}{1 - x}- \frac{56}{7 x + 3} - \frac{21}{6 x + 5} + \frac{64}{- 8 x - 9}\right)\left(\frac{\left(1 - x\right)^{4} e^{x} \sin^{8}{\left(x \right)} \cos^{2}{\left(x \right)}}{\left(- 8 x - 9\right)^{8} \left(7 x + 3\right)^{8} \sqrt{\left(6 x + 5\right)^{7}}} \right)