Rudhreswaran G posted an Question
February 02, 2021 • 19:26 pm 30 points
  • IIT JAM
  • Mathematics (MA)

How this expression as been changed

2 Answer(s) Answer Now
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    Satpal singh Best Answer

    if you are safisfied with this answer accept this as best answer

  • comment-profile-img>
    Satpal singh

    half angle formula used here . visit this link. https://www.intmath.com/analytic-trigonometry/4-half-angle-formulas.php

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