tana=2 sin^2a-3sina乘以cosa+1的值为?

已知tana=-3,求sina+2cosa/cosa-3sina和sin^2a-sinacosa 已知tana=2,则(sin^3a+cosa)/(sin^3a+sina)的值为? tana=2,则(sin^3a+cosa)/(sin^3+sina)的值 求证sin^2a*tana+cos^2a*1/tana+2sina*cosa=tana+1/tana (1-tana)/(1+tana)=2求(1)sina+cosa/(sina+2cosa) (2)sina-cosa(3)sin^2a-3cos^2a+1 已知tana/tana-1=-1,求下列各式的值（1）sina-3cosa/sina+cosa(2)sin^2a+sina*cosa+2 已知tana/（tana-1）=-1,求下列各式的值（1）sina-3cosa/sina+cosa(2)sin^2a+sina*cosa+2 tanA=1/ tanA=sinA/ cotA=cosA/ sin^2A+cos^2A= 求证1+2sina cosa/sin^2a-cos^2a=tana+1/tana-1 求证：1+2sina cosa /sin^2a -cos^2a = tana +1/tana -1. 求证 sin²a*tana+cos²a*cota+2sina*cosa=tana+cota tana=2 5-2sinacosa=?(sina+cos^3a)/cosa+sin^3a=? 已知tana=1/2 求 sin ^2a+sina*cosa-3cos^2a 已知tana=3,求sin^2a+sina*cosa+3cos^2a 已知tana=2,则sina/sin^3a-cos^3a= tana=2,求2sina+cosa/sina-cosa和sin^2a-2Sinacosa+3cos^2a 已知tana=2求2sin^2a-3sina×cosa tana=2,则2sin^a-3sina*cosa=