(4sina - 3cosa) / 5sina ==> поделим числитель и знаменатель на cosx
(4tga - 3)/5 = (4*2 - 3)/5 = (8 - 3)/5 = 5/5 = 1
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(4sina - 3cosa) / 5sina ==> поделим числитель и знаменатель на cosx
(4tga - 3)/5 = (4*2 - 3)/5 = (8 - 3)/5 = 5/5 = 1