&=π/4
f(x)=sin(3x+π/4),m=π/12
cosπ/4cos&-sin3π/4sin&=cosπ/4cos&-sinπ/4sin&=cos(π/4+&)=0,因为&绝对值<π/2 ,所以π/4+&大于-π/4小于3π/4,所以π/4+&=π/2,&=π/4
函数f(x)的图像的相邻两条对称轴之间的距离等于π/3,2π/w=2*π/3,w=3,所以f(x)=sin(3x+π/4),由函数图象知对称轴为kπ/3+π/4,固向左平移π/12个单位长度图象变为偶函数
&=π/4
f(x)=sin(3x+π/4),m=π/12
cosπ/4cos&-sin3π/4sin&=cosπ/4cos&-sinπ/4sin&=cos(π/4+&)=0,因为&绝对值<π/2 ,所以π/4+&大于-π/4小于3π/4,所以π/4+&=π/2,&=π/4
函数f(x)的图像的相邻两条对称轴之间的距离等于π/3,2π/w=2*π/3,w=3,所以f(x)=sin(3x+π/4),由函数图象知对称轴为kπ/3+π/4,固向左平移π/12个单位长度图象变为偶函数