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Question

Consider I1=π/40ex2dx,I2=π/40exdx,
I3=π/40ex2cosxdx,I4=π/40ex2sinxdx
Statement 1:I2>I1>I3>I4
Statement 2: For x(0,π4),x>x2 and cosx>sinx

A
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
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B
Statement 1 is true but statement 2 is false.
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C
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
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D
Statement 1 is false but statement 2 is true.
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Solution

The correct option is A Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
For x(0,π4)
x>x2ex>ex2I2>I1
Also,
1>cosx>sinx,x(0,π4)ex2>ex2cosx>ex2sinxI1>I3>I4I2>I1>I3>I4

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