For x∈(0,5π/2), define f(x)=∫0x tsintdt Then f has
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a
local maximum at π and local minimum at 2π.
b
local maximum at π and 2π
c
local minimum at π and 2π
d
local minimum at π and local maximum at 2π
answer is A.
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Detailed Solution
f′(x)=xsinx, so f′(x)=0⇒x=π,2π but f′′(x)=xcosx−12xsinx, so f′′(π)=−π<0 and f′′(2π)=2π>0. Hence f has local maximumat x=π and local minimum at x=2π.