Question 1 Report
If y = 2x - sin2x, find dy/dx when x = π/4
Answer Details
y = 2x cos2x - sin2x dy/dx = 2 cos2x +(-2x sin2x) - 2 cos2x = 2 cos2x - 2x sin2x - cos2x = -2x sin2x = -2 x (π/4) sin2 x (π/4) = -(π/2) x 1 = -(π/2)