已知tana=根号2,2sin²a-sinacosa+cos²a-12sin²a-sinacosa+cos²a-1等于多少,
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已知tana=根号2,2sin²a-sinacosa+cos²a-12sin²a-sinacosa+cos²a-1等于多少,
已知tana=根号2,2sin²a-sinacosa+cos²a-1
2sin²a-sinacosa+cos²a-1等于多少,
已知tana=根号2,2sin²a-sinacosa+cos²a-12sin²a-sinacosa+cos²a-1等于多少,
tana=根号2; sin²a=4/5,cos²a=1/5
2sin²a-sinacosa+cos²a-1=sin²a-sinacosa=sin²a(1-1/tana)=4/5*(1-1/根号2)
=(2-根号2) * 2/5