Suggested: sin3a+cos3a/sina+cosa=1-sina cosa - sin3a=cos3a - cos^3a.cos3a+sin^3a.sin3a=cos^3a 2a - sina+sin3a+sin5a+sin7a/cosa+cos3a+cos5a+cos7a=тан4а - sina+sin3a+sin5a/cosa+cos3a+cos5a=tan3a - cos7a+cos3a-cos5a-cosa/sin7a-sin3a-sin5a+sina - prove that sin4a=4sin cos3a-cosa sin3a - 4 sin^3a*cos3a+4cos3a*sin3a - sina-sin3a+sin5a-sin7a/cosa-cos3a-cos5a+cos7a=cos 2 a - prove that sin 4a=4sina cos3a-cosa sin3a - 4sin a.cos3a-4 cosa.sin3a - sin3a/sina-cos3a/cosa=2 - cos3a+sin3a/cosa-sina=1+2sin2a - sina+sin3a/cosa+cos3a=tan2a - sin3a+cos3a Browse related:
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