X=[π/6,7π/6]为什么sinx=[-1/2,1]

Question

X=[π/6,7π/6]为什么sinx=[-1/2,1]

Answer 1

∵当x=[π/6,7π/6]时,sinx的最大值=sin(π/2)=1, sinx的最小值=sin(7π/6)=-1/2, ∴sinx=[-1/2, 1]