1、f(x)=sin(2x+θ)+2√3(1+cos(2x+θ))/2-√3
=sin(2x+θ)+√3cos(2x+θ)+√3-√3
=2sin(2x+θ+π/3)(其中变换均用二倍角公式)
若f(x)为偶函数,f(x)=2sin(2x+π/2+2kπ)(k∈Z)
用诱导公式f(x)=2sin(2x+π/2+2kπ)=2cos(2x+2kπ)=2cos2x
即θ+π/3=π/2+2kπ,θ=π/6+2kπ,θ∈[0,π],θ=π/6.
2、由图可知,m∈(√3,2)∪{0}
f(π/12)=√3,f(π/2)=2