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  1. Paul678

    Beam Solid Angle Integral Question

    I am not a student....just an engineer doing some review. Ok, so they are going substitution here? Makes sense: https://www.math.hmc.edu/calculus/tutorials/substitution/
  2. Paul678

    Beam Solid Angle Integral Question

    Look at the first integral on this page. How did they go from Omega(A)= cos(phi) = cos(phi)sin(phi)? Is that possibly a typo?

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