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duadna23
@duadna23
July 2022
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Упростить:( cos(45-a)) ^2-cos(60+a)-sin(75-2a)cos75.
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IzaBella135
(cos(45-a))^2 - (cos(60+a))^2 - cos75*sin(75-2a) =(cos(45-a) - cos(60+a))*(cos(45-a) + cos(60+a)) - cos75*sin(75-2a) =
2sin(105/2)
sin(15/2 + a)
*
2
cos(105/2)
cos(15/2 + a)
- cos75*sin(75-2a) =
sin105 * sin(15+2a) - cos75sin(75-2a) = sin(180-75) * sin(90-(75-2a)) - cos75*sin(75-2a) =
sin(75) * cos(75-2a) - cos75*sin(75-2a) = sin(75 - (75-2a)) = sin2a
1 votes
Thanks 1
duadna23
спасибо! я его тоже добил:) Гляньте,если не сложно, на моей странице, тождество, с ним пока не могу разобраться. Лучший- обещаю!
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