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Гума111
@Гума111
July 2022
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Решите: cos(2arccos 2\3)
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Verified answer
Cos(2arccos 2\3)= 2cos ²(arccos 2\3)-1=2(cos (arccos 2\3))²-1=2·(2/3)²-1=
=8/9-1=-1/9
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Verified answer
Cos(2arccos 2\3)= 2cos ²(arccos 2\3)-1=2(cos (arccos 2\3))²-1=2·(2/3)²-1==8/9-1=-1/9