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dogson1
@dogson1
June 2022
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(sin4a-sin2a)/(con4a-cos2a)=-ctg3a доказать тождество
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dasdasfa
=2sin((4a-2a)/2)cos((4a+2a)/2) / (-2sin((4a+2a)/2) sin((4a-2a)/2)=- 2sina cos3a /2*
*sin3a sina)= - cos3a /sin3a=-ctg3a
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*sin3a sina)= - cos3a /sin3a=-ctg3a