8x^2+6kx+2k+1=0
sina+sinb=(-6k)/8=(-3k)/4
sina*sinb=(2k+1)/8
(sina)^2+(sinb)^2=[sina+sinb]^2-2sina*sinb
=[(-3k)/4]^2-2*(2k+1)/8=1.(a+b=90度)
化简(k-2)(9k+10)=0
k=2或-10/9
8x^2+6kx+2k+1=0
sina+sinb=(-6k)/8=(-3k)/4
sina*sinb=(2k+1)/8
(sina)^2+(sinb)^2=[sina+sinb]^2-2sina*sinb
=[(-3k)/4]^2-2*(2k+1)/8=1.(a+b=90度)
化简(k-2)(9k+10)=0
k=2或-10/9