Найдите значение выражения:
а) 8ѕіn 15° . cos 15°; г) sin?15° — cos?15°;
б) 4sin 22°30' - cos 22°30'; д) (2 (cos? 22,5° — sin? 22,5°);
в) sin 15° : cos 15; е) 2tg 15°: (1 — tg-15°).

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