(tan^2a-cot^2a)/(sin^2a-cod^2a)=sec^2a+csc^2a2是指2次方与a不在一起
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![(tan^2a-cot^2a)/(sin^2a-cod^2a)=sec^2a+csc^2a2是指2次方与a不在一起](/uploads/image/z/1802086-70-6.jpg?t=%28tan%5E2a-cot%5E2a%29%2F%28sin%5E2a-cod%5E2a%29%3Dsec%5E2a%2Bcsc%5E2a2%E6%98%AF%E6%8C%872%E6%AC%A1%E6%96%B9%E4%B8%8Ea%E4%B8%8D%E5%9C%A8%E4%B8%80%E8%B5%B7)
(tan^2a-cot^2a)/(sin^2a-cod^2a)=sec^2a+csc^2a2是指2次方与a不在一起
(tan^2a-cot^2a)/(sin^2a-cod^2a)=sec^2a+csc^2a
2是指2次方与a不在一起
(tan^2a-cot^2a)/(sin^2a-cod^2a)=sec^2a+csc^2a2是指2次方与a不在一起
(tan²a-cot²a)/(sin²a-cos²a)
=(sin²a/cos²a-cos²a/sin²a)/(sin²a-cos²a)
=(sin^4 a-cos^4a)/(sin²a*cos²a)(sin²a-cos²a)
=(sin²a-cos²a)(sin²a+cos²a)/(sin²a*cos²a)(sin²a-cos²a)
=(sin²a+cos²a)/(sin²a*cos²a)
=sin²a/(sin²a*cos²a)+cos²a/(sin²a*cos²a)
=1/cos²a+1/sin²a
=sec²a+csc²a