T
tuyetkhongtan


(tanx)^2+(1+tanx)^2] + 1/[(cotx)^2+(1+cotx)^2] + [(sinx + cosx)^4]/4 + (sin3x)^3
= [(sin2x)^3 - 7]/4 + (tanx)^6 + (tan2x)^6 + 2[(cotx)^3][(cot2x)^3]
= [(sin2x)^3 - 7]/4 + (tanx)^6 + (tan2x)^6 + 2[(cotx)^3][(cot2x)^3]