数学题证明=1-tanx除以1+tanx1----- - 2tanxcos^2x-----------------------1-tan^x等于sin^2x+cos^2x-------------------- -2tanxcos^2x-----------------------------1-tan^2x等于tan^2x+1-2tanx----------------------1-tan^2x
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数学题证明=1-tanx除以1+tanx1----- - 2tanxcos^2x-----------------------1-tan^x等于sin^2x+cos^2x-------------------- -2tanxcos^2x-----------------------------1-tan^2x等于tan^2x+1-2tanx----------------------1-tan^2x
数学题证明=1-tanx除以1+tanx
1
----- - 2tanx
cos^2x
-----------------------
1-tan^x
等于
sin^2x+cos^2x
-------------------- -2tanx
cos^2x
-----------------------------
1-tan^2x
等于
tan^2x+1-2tanx
----------------------
1-tan^2x
数学题证明=1-tanx除以1+tanx1----- - 2tanxcos^2x-----------------------1-tan^x等于sin^2x+cos^2x-------------------- -2tanxcos^2x-----------------------------1-tan^2x等于tan^2x+1-2tanx----------------------1-tan^2x
等于
(1-tanx)^2
----------------------
(1+tanx)(1-tanx)
等于
1-tanx
--------
1+tanx
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