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)
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![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)](/uploads/image/z/959060-20-0.jpg?t=%E5%B7%B2%E7%9F%A5sina%E6%98%AF%E6%96%B9%E7%A8%8B5x%26%23178%3B-7x-6%3D0%E7%9A%84%E6%A0%B9%2C%E6%B1%82sin%28-a-3%2F2%CF%80%29%2Asin%283%2F2%CF%80%29%2Atan%26%23178%3B%282%CF%80-a%29%2Fcos%28%CF%80%2F2-a%29%2Acos%28%CF%80%2F2%29%2Acot%28%CF%80-a%29)
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