cos^2A-sin^2A/cos^2A+sin^2A会等于1-tan^2A/1+tan^2A呢?注明所用公式,
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![cos^2A-sin^2A/cos^2A+sin^2A会等于1-tan^2A/1+tan^2A呢?注明所用公式,](/uploads/image/z/5158397-29-7.jpg?t=cos%5E2A-sin%5E2A%2Fcos%5E2A%2Bsin%5E2A%E4%BC%9A%E7%AD%89%E4%BA%8E1-tan%5E2A%2F1%2Btan%5E2A%E5%91%A2%3F%E6%B3%A8%E6%98%8E%E6%89%80%E7%94%A8%E5%85%AC%E5%BC%8F%2C)
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cos^2A-sin^2A/cos^2A+sin^2A会等于1-tan^2A/1+tan^2A呢?注明所用公式,
cos^2A-sin^2A/cos^2A+sin^2A会等于1-tan^2A/1+tan^2A呢?
注明所用公式,
cos^2A-sin^2A/cos^2A+sin^2A会等于1-tan^2A/1+tan^2A呢?注明所用公式,
分子分母同除以cos^2A不就是了吗?话说你说落了括号了吧?
cos^2A-sin^2A/cos^2A+sin^2A
=(AC/AB)² - (BC/AB) ² / (AC/AB)² + (BC/AB) ²
= ((AC ² + BC ²) / AB ² )+( BC ² / AB ² 乘 AB ² / AC ²)
= 1(勾股定理) + tan^2A
这是正确答案,汝那个应该是错的
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