化简tanatan2a/tan2a-tana 的结果A sina B cosa C sin2a D cos2a
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化简tanatan2a/tan2a-tana 的结果A sina B cosa C sin2a D cos2a
化简tanatan2a/tan2a-tana 的结果
A sina B cosa C sin2a D cos2a
化简tanatan2a/tan2a-tana 的结果A sina B cosa C sin2a D cos2a
tanatan2a/(tan2a-tana)
tan2a=2tana/(1-tan²a)
所以:
[2tan²a/(1-tan²a)]×1/[2tana/(1-tan²a)-tana]
=2tana/(1-tan²a)×1/[2/(1-tan²a)-1]
=2tana/(1-tan²a)×(1-tan²a)/(1+tan²a)
=2tana/(1+tana²a)
=2tana/csc²a
=2tana×cos²a
=2sinacosa
=sin2a
所以选C
化简tanatan2a/tan2a-tana 的结果A sina B cosa C sin2a D cos2a
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tan2a公式?
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求证1、sin l-sin y=2cos(l+y)/2 sin(l-y)/22、cos l+cos y=2cos(l+y)/2 cos(l+y)/23、cos l-cos y=-2sin (l+y)/2 sin (l-y)/24、tanatan2a/(tan2a-tana)+根号3(sin²a-cos²a)=2sin(2a-π/3)对了,还有:是否存在锐角l,y,