(1)a平行b：sinx/cosx=-3/2=tanx
tan2x=12/5
tan(2x-π/4)=(tan2x-1)/(1+tan2x)=7/17
(2)f(x)=(a+b)b=(sinx+cosx,1/2)*(cosx,-1)
f(x)=(√2/2)sin(2x+π/4)
x∈(0,π/2)
x=π/2时,f(x)有最小值-1/2