Let f be integrable over [0, a] for any real a. If we define I1=∫0π/2 cos⁡θ fsin⁡θ+cos2⁡θdθ and I2=∫0π/2 sin⁡2θ fsin⁡θ+cos2⁡θdθ, then 

Let f be integrable over [0, a] for any real a. If we define I1=0π/2cosθ fsinθ+cos2θ and I2=0π/2sin2θ fsinθ+cos2θ, then 

  1. A

    I1=I2

  2. B

    I1=-I2

  3. C

    I1=2I2

  4. D

    I1=-2I2

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    Solution:

    I1I2=0π/2(cosθsin2θ)fsinθ+cos2θ

    put, sinθ+cos2θ=t(cosθsin2θ)=dt

    then,

    I1I2=11f(t)dt=0I1=I2

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