已知sina+cosa=p,求(1)sina*cosa(2)sin^2a-cos^2a(3)sin^3a+-cos^3a(4)sin^4a+-ctg^3a
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![已知sina+cosa=p,求(1)sina*cosa(2)sin^2a-cos^2a(3)sin^3a+-cos^3a(4)sin^4a+-ctg^3a](/uploads/image/z/746195-59-5.jpg?t=%E5%B7%B2%E7%9F%A5sina%2Bcosa%3Dp%2C%E6%B1%82%281%29sina%2Acosa%282%29sin%5E2a-cos%5E2a%283%29sin%5E3a%2B-cos%5E3a%284%29sin%5E4a%2B-ctg%5E3a)
已知sina+cosa=p,求(1)sina*cosa(2)sin^2a-cos^2a(3)sin^3a+-cos^3a(4)sin^4a+-ctg^3a
已知sina+cosa=p,求(1)sina*cosa(2)sin^2a-cos^2a(3)sin^3a+-cos^3a(4)sin^4a+-ctg^3a
已知sina+cosa=p,求(1)sina*cosa(2)sin^2a-cos^2a(3)sin^3a+-cos^3a(4)sin^4a+-ctg^3a
1,(p^2-1)/2
2,p*根号(2-p^2)
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