◆◆◆求证sin^2a+sin^2β-sin^a*sin^2β+cos^2a*cos^2β=1最好步骤简洁,能够让人明白,禁止抄袭!应是sin^2a+sin^2β-sin^2a*sin^2β+cos^2a*cos^2β=1
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![◆◆◆求证sin^2a+sin^2β-sin^a*sin^2β+cos^2a*cos^2β=1最好步骤简洁,能够让人明白,禁止抄袭!应是sin^2a+sin^2β-sin^2a*sin^2β+cos^2a*cos^2β=1](/uploads/image/z/665957-29-7.jpg?t=%E2%97%86%E2%97%86%E2%97%86%E6%B1%82%E8%AF%81sin%5E2a%2Bsin%5E2%CE%B2-sin%5Ea%2Asin%5E2%CE%B2%2Bcos%5E2a%2Acos%5E2%CE%B2%3D1%E6%9C%80%E5%A5%BD%E6%AD%A5%E9%AA%A4%E7%AE%80%E6%B4%81%2C%E8%83%BD%E5%A4%9F%E8%AE%A9%E4%BA%BA%E6%98%8E%E7%99%BD%2C%E7%A6%81%E6%AD%A2%E6%8A%84%E8%A2%AD%21%E5%BA%94%E6%98%AFsin%5E2a%2Bsin%5E2%CE%B2-sin%5E2a%2Asin%5E2%CE%B2%2Bcos%5E2a%2Acos%5E2%CE%B2%3D1)
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