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y in (-oo:+oo)
sin(69) = y/54 // - y/54
sin(69)-(y/54) = 0
sin(69)-1/54*y = 0 // - sin(69)
-1/54*y = -sin(69) // : -1/54
y = -sin(69)/(-1/54)
y = 54*sin(69)
y = 54*sin(69)
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