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sayndwif
@sayndwif
September 2021
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288 Помогите пожалуйста в заранее спасибо!
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hlopushinairina
1)sinα=3/5;
cosα=⁺₋√(1-sin²α)=₊⁺√1-9/25=⁺₋√16/25=⁺₋4/5;
tgα=sinα/cosα=⁺₋3/5:4/5=⁺₋3/5·5/4=⁺₋3/4;
ctgα=1/tgα=⁺₋1:3/4=⁺₋4/3;
2)sinα=40/41;
cosα=⁺₋√1-1600/1681=⁺₋√81/1681=⁺₋9/41;
tgα=sinα/cosα=40/41:(⁺₋9/41)=⁺₋40/9;
ctgα=1/tgα=⁺₋9/40;
3)sinα=0.5;
cosα=⁺₋√1-0.25=⁺₋√0.75=⁺₋0.5√3;
tgα=⁺₋0.5/0.5√3=⁺₋√3/3;
ctgα=⁺₋0.5√3/0.5=√3;
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Answers & Comments
cosα=⁺₋√(1-sin²α)=₊⁺√1-9/25=⁺₋√16/25=⁺₋4/5;
tgα=sinα/cosα=⁺₋3/5:4/5=⁺₋3/5·5/4=⁺₋3/4;
ctgα=1/tgα=⁺₋1:3/4=⁺₋4/3;
2)sinα=40/41;
cosα=⁺₋√1-1600/1681=⁺₋√81/1681=⁺₋9/41;
tgα=sinα/cosα=40/41:(⁺₋9/41)=⁺₋40/9;
ctgα=1/tgα=⁺₋9/40;
3)sinα=0.5;
cosα=⁺₋√1-0.25=⁺₋√0.75=⁺₋0.5√3;
tgα=⁺₋0.5/0.5√3=⁺₋√3/3;
ctgα=⁺₋0.5√3/0.5=√3;