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andrey377
@andrey377
August 2022
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Доказать тождество (sin a -cos a )^2=1-sin 2a и вот это
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IrkaShevko
Verified answer
(sin a)^2 + (cos a)^2 = 1 - основное тригонометрическое тождество
2*(sin a)*(cos a) = sin 2a - формула синуса двойного угла
(sin a - cos a)^2 = (sin a)^2 + (cos a)^2 - 2*(sin a)*(cos a) = 1 - sin 2a
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Verified answer
(sin a)^2 + (cos a)^2 = 1 - основное тригонометрическое тождество2*(sin a)*(cos a) = sin 2a - формула синуса двойного угла
(sin a - cos a)^2 = (sin a)^2 + (cos a)^2 - 2*(sin a)*(cos a) = 1 - sin 2a