Idk how the answer simplified this

I’m trying to do a double angle differentiation to find the max angle in terms of the distance… But I don’t know how the answers went from one side to the next in the photo…

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Oh btw it = tanθ (theta no zero)

  • Re-write the “four storey” fraction as two separate fractions

  • Re-write the expression you divide by (1 + 0.42/d^2) as one fraction by bringing both terms to a common denominator (d^2)

  • Divide fractions

  • Simplify resulting fraction