July 2022 1 1 Report

Докажите тождество:

 

1.tg a/1-tg^2 a * ctg^2 a-1/ctg a = 1

 

2.(tg^2 a+ctg^2a)*sin^2 a/tg^4 a+1 = cos^2 a

 

3.(ctg^2 a-tg^2 a)*1/ctg^2 a-1 = 1/cos^2 a

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