cosb* sinb/cosb 1 cos²b
= _______________ --- (cosb/sinb)*cosb= _________-- __________ =_
sin²b sinb sinb
1-cos²b sin²b
=___________=_________= sinb
sinb sinb
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ваше условие = ( cosβ · sin β ) / ( sin²β · cosβ) - (cosβ · cos β) /sin β = (сокращаем) = 1/sinβ - cos²β / sinβ = ( знаменатели одинаковые) = (1 - cos² β )
/sin β = sin ² β / sin β = sinβ
cosb* sinb/cosb 1 cos²b
= _______________ --- (cosb/sinb)*cosb= _________-- __________ =_
sin²b sinb sinb
1-cos²b sin²b
=___________=_________= sinb
sinb sinb