Предмет: Геометрия, автор: kuchmaliana

cos90°+sin30° обчислити

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Автор ответа: aidlove25

cos 90°=0
sin 30°= 1/2

cos90°+sin30°=0+1/2=1/2

Синус 30° нужно запомнить что он равен 1/2. А вот cos90° можно запомнить так:
cos, на отрезке это АБСЦИССА. Рисуешь окружность, где центр в середине. находишь на окружность 90°. Он будет находится на 0 абсциссе, и какой-то там ординате. Получается, что если cos—абсцисса. То cos 90°=0

Автор ответа: ostapenko981

Объяснение:

0+1/2=0,5

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cos90°+sin30° обчислити ​

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cos90°+sin30° обчислити