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tanya3dias
@tanya3dias
August 2021
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упростите, пожалуйста:
1). sin^2α+cos^2α+tg^2α
2). cos^2α(1+ctg^2α)
3). 1-1/cos^2α
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1)sin^2a+cos^2a+tg^2a=1+tg^2a=1/cos^2a
2)cos^2a(1+ctg^2a)=cos^2a×1/sin^2a=cos^2a/sin^2a
3)1-1/cos^2a=1-1+tg^2a=tg^2a
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Answers & Comments
2)cos^2a(1+ctg^2a)=cos^2a×1/sin^2a=cos^2a/sin^2a
3)1-1/cos^2a=1-1+tg^2a=tg^2a