Question

已知函数f(x)=2√3sinxcosx-cos(2x+π)-1

Answer 1

0＜φ＜π／2均可.先化简：f(x)=√3sin2x+cos2x-1=2sin(2x+φ)-1 令-π／2+2kπ≦2x+φ≦π／2+2kπ 得 -π／4-φ/2+kπ≦x≦π／4-φ/2+kπ 令 π／4-φ/2≦π/4 且 -π／4-φ/2≧0 又0