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Question

Area between the curve y = cos x and x- axis when 0 x is [MP PET 1997]


A

2

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B

4

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C
3
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D
\N
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Solution

The correct option is B

4


y=cos x, When x ϵ[0,π2],cos x 0
When x ϵ[π2,3π2],cos x 0
When x ϵ[3π2,2π],cos x0
Thus required area is given by,
π20y dx=π20cos x dx+3π2π2(cos x)dx+2π3π2cos x dx
= 1 + 2 + 1 = 4sq.unit

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