Cos a = 21/29 ctg a - ?
при ( 3п/2;2п)
__________
sin a = 1- 21/29 = 8/29
ctg a = 21/29 : 8/29 = 21/8 = 2,625 (посчитайте)
Вопрос: что тут, с#ка, неправильно?
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