已知tanx=-2^(1/2),-π/2
问题描述:
已知tanx=-2^(1/2),-π/2
答
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
答
tanx=-2^(1/2),-π/2