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pupsikpupsik112
@pupsikpupsik112
July 2022
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найти tg a, если 45sin^2 a + 11 cos^2 a = 20 и a принадлежит(пи/2;пи)
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Rjkz11111
Sin^2a=1-cos^2a
45-45cos^2a+11cos^2a=20
-34cos^2a=-25
cos^2a=25/34
sin^2a=1-25/34=9/34
tga=-3/5
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Answers & Comments
45-45cos^2a+11cos^2a=20
-34cos^2a=-25
cos^2a=25/34
sin^2a=1-25/34=9/34
tga=-3/5