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bew25
@bew25
August 2021
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1) (sin π/4 + cos 3π/2)tg п/3 / ctg п/6 - ctg п/2 =
2) Дано:
sin a = -3/5 270гр. =< a =< 360гр.
Найти:
cos a, tg a, ctg a
3) уравнения
а) cos x/2 = 0
б) sin 3х = 0.5
4) Доказать тождество
2sin a + 2sin a *cos a/2sin a - 2sin a * cos a = ctg^2 a/2
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