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Vanshika posted an Question
July 29, 2020 • 21:15 pm 30 points
  • IIT JAM
  • Physics (PH)

Plz explain me 1,2,3 steps as marked....!!!

I don't understand the flowing steps ....which formulas are used? plz helo me out

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    Ravi prakash yadav Best Answer

    in step 1,they have simply expanded using formula for sin(a)cos(b)=(sin(b+a)+sin(b-a))/2. In step 2 they have simply integrated,but step 2 is written incorrect. See the attachment

    cropped4623989272281221531.jpg
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    Deepak singh 1

    in first , use this formula ,

    cropped1413547898.jpg
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    in second , there is simple integration of sin function

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