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tan^2θ =2tan^2Ф+1 求证 cos2θ +sin^2Ф=0如题.sin^2a/(1-sin^2a)=2sin^2⊙/(1-sin^2⊙)+1sin^2a/(1-sin^2a+sin^2a)=(sin^2⊙+1)/(1-sin^2⊙+sin^2⊙+1)这是怎么来的。
题目内容:
tan^2θ =2tan^2Ф+1 求证 cos2θ +sin^2Ф=0
如题.
sin^2a/(1-sin^2a)=2sin^2⊙/(1-sin^2⊙)+1
sin^2a/(1-sin^2a+sin^2a)
=(sin^2⊙+1)/(1-sin^2⊙+sin^2⊙+1)
这是怎么来的。
tan^2θ =2tan^2Ф+1 求证 cos2θ +sin^2Ф=0
如题.
sin^2a/(1-sin^2a)=2sin^2⊙/(1-sin^2⊙)+1
sin^2a/(1-sin^2a+sin^2a)
=(sin^2⊙+1)/(1-sin^2⊙+sin^2⊙+1)
这是怎么来的。
如题.
sin^2a/(1-sin^2a)=2sin^2⊙/(1-sin^2⊙)+1
sin^2a/(1-sin^2a+sin^2a)
=(sin^2⊙+1)/(1-sin^2⊙+sin^2⊙+1)
这是怎么来的。
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