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royrobert2000
@royrobert2000
July 2022
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Докажите тождество:
ctg x/ tg x+ctg x = cos²x
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Answers & Comments
Lesben
Ctgx/(tgx+ctgx)=(cosx/sinx)/(sinx/cosx+cosx/sinx)=
=(cosx/sinx)/((sin²x+cos²x)/sinxcosx)=(cosx/sinx)/(1/sinxcos))=
=(cosx/sinx)(sinxcosx)=sinxcos²x/sinx=cos²x
(x≠kπ/2,k∈Z)
2 votes
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пжаши
Rhv*()jfjfclw xpe(fhrnckd)'fkelznav(rjcoex)+rjdcoed-(hrjxk)
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royrobert2000
если ты так выражаешь свои мысли, то ты дегенерат....
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Answers & Comments
=(cosx/sinx)/((sin²x+cos²x)/sinxcosx)=(cosx/sinx)/(1/sinxcos))=
=(cosx/sinx)(sinxcosx)=sinxcos²x/sinx=cos²x
(x≠kπ/2,k∈Z)