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zhenya2209
@zhenya2209
July 2022
1
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tg^2a+ctg^2A если tga-ctga=-3
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zews1065
Verified answer
Tga-ctga= -3, возведем в квадрат левую и правую часть:
(tga-ctga)²= (-3)²
tg²a-2 tga ctga+ctg²a=9, так как tga
ctga = 1, то получаем
tg²a-2+ctg²a
=9
tg²a+ctg²a
=11
47 votes
Thanks 91
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Answers & Comments
Verified answer
Tga-ctga= -3, возведем в квадрат левую и правую часть:(tga-ctga)²= (-3)²
tg²a-2 tga ctga+ctg²a=9, так как tga ctga = 1, то получаем
tg²a-2+ctg²a=9
tg²a+ctg²a=11