Номер 4 !! срочно пожалуйста!!. Created by alekseicat. algebra-ru

Номер 4 !! срочно пожалуйста!!...

alekseicat @alekseicat

November 2021 1 7 Report

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

2 votes Thanks 1

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Verified answer

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