Предмет: Геометрия, автор: namesuriken

Знайдіть cosa i tga, якщо sina 24/25 i 90° < a < 180°

Ответы

Автор ответа: zmeura1204

Ответ:

cosa=-7/25

tga=-24/7

Объяснение:

Тригонометрична тотожність:

sin²a+cos²a=1;

cosa=-√(1-sin²a)=-√(1-(24/25))=

=-√(625/625-576/625)=

=-√(49/625)=-7/25

Тригонометрична тотожність

tga=sina/cosa=24/25:(-7/25)=

=-(24/25*25/7)=-24/7

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