Формула синуса двойного угла
sin 2a = 2sin a*cos a
12sin 66/(cos 33*cos 57) = 12*2sin 33*cos 33/(cos 33*cos 57) =
= 24sin 33/cos(90-33) = 24sin 33/sin 33 = 24
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Формула синуса двойного угла
sin 2a = 2sin a*cos a
12sin 66/(cos 33*cos 57) = 12*2sin 33*cos 33/(cos 33*cos 57) =
= 24sin 33/cos(90-33) = 24sin 33/sin 33 = 24