已知sina=根号5/5,则sin^4-cos^4a得值?
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![已知sina=根号5/5,则sin^4-cos^4a得值?](/uploads/image/z/1801832-32-2.jpg?t=%E5%B7%B2%E7%9F%A5sina%3D%E6%A0%B9%E5%8F%B75%2F5%2C%E5%88%99sin%5E4-cos%5E4a%E5%BE%97%E5%80%BC%3F)
已知sina=根号5/5,则sin^4-cos^4a得值?
已知sina=根号5/5,则sin^4-cos^4a得值?
已知sina=根号5/5,则sin^4-cos^4a得值?
负3/5
已知sina=根号5/5,则sin^4 a-cos^4 a [急!]
已知sina=根号5/5,则sin^4-cos^4a得值?
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