已知sina是方程5x²-7x-6=0的根,求sin(-a-3/2π)*sin(3/2π)*tan²(2π-a)/cos(π/2-a)*cos(π/2)*cot(π-a)

已知sina是方程5x²-7x-6=0的根,求sin(-a-3/2π)*sin(3/2π)*tan²(2π-a)/cos(π/2-a)*cos(π/2)*cot(π-a)
已知sina是方程5x²-7x-6=0的根,
求sin(-a-3/2π)*sin(3/2π)*tan²(2π-a)/cos(π/2-a)*cos(π/2)*cot(π-a)

已知sina是方程5x²-7x-6=0的根,求sin(-a-3/2π)*sin(3/2π)*tan²(2π-a)/cos(π/2-a)*cos(π/2)*cot(π-a)
sina是方程5x²-7x-6=0的根,
sina=-3/5
sin(-a-3/2π)*sin(3/2π)*tan²(2π-a)/cos(π/2-a)*cos(π/2)*cot(π-a)
=-tana^2
=-16/9