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Question

lf x(3x)2, then sin1(x)+sin1(x2)++sin1(x10)=

A
π2
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B
2π
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C
5π
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D
10π
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Solution

The correct option is C 5π
If x(3x)2
x23x+20
(x1)(x2)0
x belongs to[1,2] ........(i)
But, We have 1x,x2,...,x101 ...........(ii)
from (i) and (ii)
1x1
Hence, x=1
=π2+.....+π2
=10×π2=5π

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