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sitesprodan
@sitesprodan
July 2022
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докажите тождество (cos^2a)/(1-cos^2(pi/2+a)=tg((3pi/2)+a)*tg(-a)
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sedinalana
Verified answer
Cos²a/(1-cos²(π/2+a))=cos²a/(1-sin²a)=cos²a/cos²a)=1
tg(3π/2+a)*tg(-a)=-ctga*(-tga)=1
1=1
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Answers & Comments
Verified answer
Cos²a/(1-cos²(π/2+a))=cos²a/(1-sin²a)=cos²a/cos²a)=1tg(3π/2+a)*tg(-a)=-ctga*(-tga)=1
1=1