What is the derivative of cos(pi x)? Calculus Basic Differentiation Rules Chain Rule 1 Answer Shwetank Mauria Feb 3, 2017 (dy)/(dx)=-pisin(pix) Explanation: We use chain rule here As y=cos(pix) (dy)/(dx)=d/(d(pix))cos(pix)xxd/(dx)(pix) = -sin(pix)xxpi = -pisin(pix) Answer link Related questions What is the Chain Rule for derivatives? How do you find the derivative of y= 6cos(x^2) ? How do you find the derivative of y=6 cos(x^3+3) ? How do you find the derivative of y=e^(x^2) ? How do you find the derivative of y=ln(sin(x)) ? How do you find the derivative of y=ln(e^x+3) ? How do you find the derivative of y=tan(5x) ? How do you find the derivative of y= (4x-x^2)^10 ? How do you find the derivative of y= (x^2+3x+5)^(1/4) ? How do you find the derivative of y= ((1+x)/(1-x))^3 ? See all questions in Chain Rule Impact of this question 2848 views around the world You can reuse this answer Creative Commons License