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АннаКудух555
@АннаКудух555
July 2022
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1-sina/cosa+tga
1/1+cosa+1/cos-a
ctg2b(cosb-1)+1
tgb+1/1+ctgb
номер 79
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sedinalana
Verified answer
1
(1-cosa)/cosa+sina/cosa=(1-sina+sina)/cosa=1/cosa
2
1/(1+cosa)+1/(1-cosa)=(1-cosa+1+cosa)/(1-cos²a)=2/sin²a
3
cos²b/sin²b*(-sin²b)+1=-cos²b+1=sin²b
4
(sinb/cosb+1):(1+cosb/sinb)=(sinb+cosb)/cosb*sinb/(sinb+cosb)=
=sinb/cosb=tgb
2 votes
Thanks 1
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Answers & Comments
Verified answer
1(1-cosa)/cosa+sina/cosa=(1-sina+sina)/cosa=1/cosa
2
1/(1+cosa)+1/(1-cosa)=(1-cosa+1+cosa)/(1-cos²a)=2/sin²a
3
cos²b/sin²b*(-sin²b)+1=-cos²b+1=sin²b
4
(sinb/cosb+1):(1+cosb/sinb)=(sinb+cosb)/cosb*sinb/(sinb+cosb)=
=sinb/cosb=tgb