alleryStart learning →For y = sin x, dy/dx at x = π/2 is:
A0
Bcos(π/2) = 0
C1
D-1
Answer & Solution
Correct answer: B. cos(π/2) = 0
d/dx(sin x) = cos x.
At x = π/2: cos(π/2) = 0. Sin has horizontal tangent (max) at π/2.
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