How do do you differentiate #f(x)= (x+sinx)/(cosx)#? Calculus Differentiating Trigonometric Functions Derivative Rules for y=cos(x) and y=tan(x) 1 Answer VinÃcius Ferraz May 18, 2018 #f'(x) = frac{cos x + x sin x + 1}{cos^2 x}# Explanation: #f'(x) = frac{(1 + cos x) cos x - (x + sin x)(- sin x)}{cos^2 x}# # = frac{cos x + cos^2 x + x sin x + sin^2 x}{cos^2 x}# Answer link Related questions What is the derivative of #y=cos(x)# ? What is the derivative of #y=tan(x)# ? How do you find the 108th derivative of #y=cos(x)# ? How do you find the derivative of #y=cos(x)# from first principle? How do you find the derivative of #y=cos(x^2)# ? How do you find the derivative of #y=e^x cos(x)# ? How do you find the derivative of #y=x^cos(x)#? How do you find the second derivative of #y=cos(x^2)# ? How do you find the 50th derivative of #y=cos(x)# ? How do you find the derivative of #y=cos(x^2)# ? See all questions in Derivative Rules for y=cos(x) and y=tan(x) Impact of this question 1629 views around the world You can reuse this answer Creative Commons License