cos a = b/c
c = b/cos a
sin a = a/c
a = sin a × c = sin a × b / cos a
k = 90° =>
угол b = 90 - угол a
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cos a = b/c
c = b/cos a
sin a = a/c
a = sin a × c = sin a × b / cos a
k = 90° =>
угол b = 90 - угол a