How do you find the derivative of #cos(pi*x^2)#?
1 Answer
Dec 16, 2016
Explanation:
differentiate using the
#color(blue)"chain rule"#
#color(orange)"Reminder " color(red)(bar(ul(|color(white)(2/2)color(black)(d/dx(cos(f(x)))=-sin(f(x)).f'(x)))color(white)(2/2)|))#
#rArrd/dx[cos(pix^2)]=-sin(pix^2).d/dx(pix^2)#
#=-2pixsin(pix^2)#
