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oksana200eva
@oksana200eva
July 2022
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cos(a-90)/sin(180-a) + tg(a-180)*cos(180+a)*sin(270+a)/tg(270+a)
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nKrynka
Решение
Cos(a-90)/sin(180-a) + tg(a-180)*cos(180+a)*sin(270+a)/tg(270+a) =
= sina* sina - tga * cosa * cosa / (- tga) = sin
²a + cos²a = 1
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Answers & Comments
Cos(a-90)/sin(180-a) + tg(a-180)*cos(180+a)*sin(270+a)/tg(270+a) =
= sina* sina - tga * cosa * cosa / (- tga) = sin²a + cos²a = 1