[(tana*tan2a)/(tan2a-tana)]+√3(sin ^2 a-cos^2 a)=2sin [2a-(pi/3)]要过程,
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[(tana*tan2a)/(tan2a-tana)]+√3(sin^2a-cos^2a)=2sin[2a-(pi/3)]要过程,[(tana*tan2a)/(tan2a-tana)]+√3(sin^
[(tana*tan2a)/(tan2a-tana)]+√3(sin ^2 a-cos^2 a)=2sin [2a-(pi/3)]要过程,
[(tana*tan2a)/(tan2a-tana)]+√3(sin ^2 a-cos^2 a)=2sin [2a-(pi/3)]要过程,
[(tana*tan2a)/(tan2a-tana)]+√3(sin ^2 a-cos^2 a)=2sin [2a-(pi/3)]要过程,
这个题目的关键是处理(tana*tan2a)/(tan2a-tana)
把tana=sina/cosa,tan2a=sin2a/cos2a
代入得
(tana*tan2a)/(tan2a-tana)
=sinasin2a/(cosaasin2a-sinacos2a)
=sinasin2a/sin(2a-a)
=sin2a
后面的想必你会了
原式=sin2a*sina/(sin2a*cosa-cos2a*sina)-√3(cos^2 a-sin ^2 a)
=sin2a*sina/sina-√3cos2a
=sin2a-√3cos2a
=2(1/2sin2a-√3/2cos2a)
=2sin (2a-π/3)
求证:tan3A-tan2A-tanA=tanA*tan2A*tan3A
求证:tan3A-tan2A-tanA=tanA*tan2A*tan3A
化简:tana+tan2a+tanatan2atan3a=
tana=2,tan2a=?
tan2a=2tana/[1-(tana)^2
求证tanA-1/tanA=-(2/tan2A)
化简 tanA-1/tanA+2/tan2A
使tana和tan2a有意义的条件
求证tan3A-tan2A-tanA=tan3Atan2Atan1A
求证:tan3a-tan2a-tana=tan3a-tanatan2a
tan2a=1/3,求tana
tan2a=1/3,求tana
tan2A=4/3,求tanA
若tana=3,则tan2a=
tana=2/3,tan2a=?
tan2A=3/4、tanA=?
tana=2/3,tan2a=?
已知tana=2,求tan2a-tana/1+tan2a·tana的值