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kateshash
@kateshash
August 2022
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как упростить выражение соs4x+1?
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ann1885
Cos4x+1=2cos²2x - 1 + 1 = 2cos²2x
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Thanks 2
kateshash
а откуда взялось 2соs^2x
kateshash
2cos^2x-1?
ann1885
формула двойного угла для косинуса только мы 4х=2*2х
kateshash
и? получается соs^2 2x-sin^2 2x-1
kateshash
вернее +1
ann1885
сos4x = 2cos^2 2x - 1 , формула есть сos2x=2cos^2x -1
kateshash
спасибо большое
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