Синус косинус від 0 до 180
Flashcard
•
Mathematics
•
9th Grade
•
Hard
Наталія Бондарева
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4 questions
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1.
FLASHCARD QUESTION
Front
Яке півколо називається одиничним?
Back
півколо радіуса 1, центр якого збігається з початком координат
2.
FLASHCARD QUESTION
Front
Косинус і синус кута α, 0°≤α≤180° – це …
Back
це відповідні абсциса і ордината точки одиничного півкола, яка відповідає куту
3.
FLASHCARD QUESTION
Front
Чи існує кут α, 0°≤α≤180°, для якого cosα=-0,2? Поясніть, чому?
Back
Оскільки абциса точок одиничного півкола змінюються в межах –1 ≤х ≤ 1, то для довільного a такого, що 0° ≤a ≤180°, справджуються нерівності: –1 ≤ cos a ≤ 1.
4.
FLASHCARD QUESTION
Front
Чому дорівнює sin (180°-α)? cos (180°-α)?
Back
sin(180-α)=sinα
cos(180-α)=-cosα
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