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alekseicat
@alekseicat
November 2021
1
13
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Номер 4 !! срочно пожалуйста!!
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sedinalana
Verified answer
Tga/2=6/5
cos²a/2=1:(1+tg²a/2)=1:(1+36/25)=25/61
cosa/2=5/√61
cosa=2cos²a/2-1=2*25/61-1=50/61-1=-11/61
sina/2=√(1-cos²a/2)=√(1-25/61)=6/√61
sina=2sina/2cosa/2=2*6/√61*5/√61=60/61
tga=sina/cosa=60/61:(-11/61)=-60/11
ctga=1/tga=-11/60
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Answers & Comments
Verified answer
Tga/2=6/5cos²a/2=1:(1+tg²a/2)=1:(1+36/25)=25/61
cosa/2=5/√61
cosa=2cos²a/2-1=2*25/61-1=50/61-1=-11/61
sina/2=√(1-cos²a/2)=√(1-25/61)=6/√61
sina=2sina/2cosa/2=2*6/√61*5/√61=60/61
tga=sina/cosa=60/61:(-11/61)=-60/11
ctga=1/tga=-11/60