1 f(x)=1/2cos(2x+π/6)+1/2
x0=kπ-π/12,取x0=11π/12
x0=kπ+5π/12,取x0=5π/12
∴g(x0)=3/4或5/4
2 h(x)=1/2cos(2x-π/6)+3/2
kπ+π/12