（1）∵tanθ=-34，∴原式=1+tanθtanθ-2=1-34-34-2=-111；（2）∵tanθ=-34，∴原式=2(sin2θ+cos2θ)+sinθcosθ-cos2θsin2θ+cos2θ=2sin2θ+sinθcosθ+cos2θsin2θ+cos2θ=2tan2θ+tanθ+1tan2θ+1=2×916-3...