3. Найдите значение sin a, tga и ctga, если cos a =5/17. Created by mrrus31.

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3. Найдите значение sin a, tga и ctga, если cos a =5/17

svetlanavaslarionova

Ответ:

Sinα=√(1-Cos²α); Sinα=√(1-25/289)=√264/289=√264/17

tgα=sinα/cosα=√264/17:5/17=√264/5

ctgα=cosα/Sinα=5/√264

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