f(x)>=f(5n/12)成立
就是x=5n/12时sin(2x+a)有最小值
2*5n/12+a=3n/2
a=2/3*n
f(x)=Asin(2x+a)=Asin(2x+2/3*n)
f(x)=0
sin(2x+2/3*n)=0
2x+2/3*n=kn
x=kn/2-1/3n(n属于Z)
已知函数f(x)=Asin(2x+a)(A>0,0
f(x)>=f(5n/12)成立
就是x=5n/12时sin(2x+a)有最小值
2*5n/12+a=3n/2
a=2/3*n
f(x)=Asin(2x+a)=Asin(2x+2/3*n)
f(x)=0
sin(2x+2/3*n)=0
2x+2/3*n=kn
x=kn/2-1/3n(n属于Z)