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lzadorohna
@lzadorohna
November 2021
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Упростите уравнение:
sin a-3sin2a+sin3a/cos a-3cos2a+cos3a
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армения2017
1)sina+sin3a-3sln2a=2sin(a+3a)2 cos(a-3a)/2-
-3sin2a=2sin2a cosa-3sin2a=sin2a(2cosa-3)
2)cosa+cos3a-3cos2a=2cos2a cosa-3cos2a=cos2a(2cosa-3)
3)1):2)=sin2a:cos2a=tg2a
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Answers & Comments
-3sin2a=2sin2a cosa-3sin2a=sin2a(2cosa-3)
2)cosa+cos3a-3cos2a=2cos2a cosa-3cos2a=cos2a(2cosa-3)
3)1):2)=sin2a:cos2a=tg2a