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moved from general forum so homework template is missing

I have found solutions to a question I am trying to figure out, and I am unsure how they got from one step to the next. Is it some sort of integration??

Eqn 1) 0.625 = sin(theta) - 0.5cos(theta)

Eqn 2) 0.625 = sqrt(1 - x^2) - 0.5x

Eqn 1) 0.625 = sin(theta) - 0.5cos(theta)

Eqn 2) 0.625 = sqrt(1 - x^2) - 0.5x