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NMK , survey errors leveling

NMK , survey errors leveling

I have a task in the field of conditional leveling, applying MNK, and I was given the opportunity to form a conditional sine equation of a triangle. I looked at the solution, but it is not clear to me how it was formed, I know for a fact that I put in the numerator under the sine function the complementary angles to those I put in the denominator under the sine function, so that the quotient of the sine of the angles is 1, which is not obvious here

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