(三角函数)计算已知锐角a的正切值是方程2x^2+x-6=0的一根,求(3+2cos²a)/(sin²a+sina×cosa+cos²a的值以求出x=1.5,x=-2
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![(三角函数)计算已知锐角a的正切值是方程2x^2+x-6=0的一根,求(3+2cos²a)/(sin²a+sina×cosa+cos²a的值以求出x=1.5,x=-2](/uploads/image/z/6870111-15-1.jpg?t=%EF%BC%88%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%EF%BC%89%E8%AE%A1%E7%AE%97%E5%B7%B2%E7%9F%A5%E9%94%90%E8%A7%92a%E7%9A%84%E6%AD%A3%E5%88%87%E5%80%BC%E6%98%AF%E6%96%B9%E7%A8%8B2x%5E2%2Bx-6%3D0%E7%9A%84%E4%B8%80%E6%A0%B9%2C%E6%B1%82%EF%BC%883%2B2cos%26sup2%3Ba%EF%BC%89%2F%EF%BC%88sin%26sup2%3Ba%2Bsina%C3%97cosa%2Bcos%26sup2%3Ba%E7%9A%84%E5%80%BC%E4%BB%A5%E6%B1%82%E5%87%BAx%3D1.5%2Cx%3D-2)
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