If y 2x - sin2x find dy dx when x 4 - JAMB Mathematics 2000 Question
If y = 2x - sin2x, find dy/dx when x = π/4
A
π
B
-π
C
π/2
D
-π/2
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Correct Option: D
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)
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