若Y=3Sin(2x—π/3+φ)+1是偶函数,则φ是多少
问题描述：
若Y=3Sin(2x—π/3+φ)+1是偶函数,则φ是多少
答
Y=f(x)=3Sin(2x—π/3+φ)+1是偶函数f(-x)=f(x)∴3sin(-2x+Φ-π/3)+1=3sin(2x+Φ-π/3)+1∴sin(-2x)cos(Φ-π/3)+cos(-2x)sin(Φ-π/3)=sin2xcos(Φ-π/3)+cos2xsin(Φ-π/3)∴-sin2xcos(Φ-π/3)+cos2xsin(Φ-π/3...