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H3RURG
H3RURG
15.08.2021 16:16 •  Алгебра

6. Верно ли равенство:
а) 2cos 209 . cos 40° = cos 20°;
в) 2sin 40° cos 50° 1-sin 10.

Показать ответ
Ответ:
fatima52
fatima52
30.12.2020 19:06
Строишь график функции y = 3x² и сдвигаешь его на 2,5 единичных отрезка влево. (Ты вообще можешь сразу провести пунктиром линию x = 2,5 (это вертикальная линия, которая пересекается с осью Оx в точке 2,5) и строить свой график, как будто твой пунктир -  это ось Оy).
График y = 3x² строится как зауженная парабола, проходящая через точки (0; 0), (1; 3), (2; 12), (-1; 3), (-2; 12).
Окончательный график (ну, тот, который и надо было построить) будет проходить через точки, у которых вторая координата, т.е. y, будет такая же, как у графика y = 3x², а первую, т.е. x, каждый раз надо уменьшать на 2,5. Т.е. это будут точки (-2,5; 0), (-1,5; 3), (-0,5; 12), (-3,5; 3), (-4,5; 12).
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Ответ:
арсений201
арсений201
19.04.2020 03:00

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