已知tanx=-2^(1/2),-π/2

问题描述:

已知tanx=-2^(1/2),-π/2

sinx=-(2/3)^(1/2) cosx=(1/3)^(1/2)
sin(x-π/6)=根号3/2sinx-1/2cosx
=-根号2/2-根号3/6

tanx=-2^(1/2),-π/2