1:已知F(X)=2X³-6X²+A(A为常数)在[-1.2]上有最小值5,那么在此区间上的最大值是?2:COSASINC+COSCSINA/SINASINC=SIN(A+B)/SIN²B=1/SINB怎么化过来的?
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![1:已知F(X)=2X³-6X²+A(A为常数)在[-1.2]上有最小值5,那么在此区间上的最大值是?2:COSASINC+COSCSINA/SINASINC=SIN(A+B)/SIN²B=1/SINB怎么化过来的?](/uploads/image/z/3014554-58-4.jpg?t=1%EF%BC%9A%E5%B7%B2%E7%9F%A5F%28X%29%3D2X%26sup3%3B-6X%26sup2%3B%2BA%EF%BC%88A%E4%B8%BA%E5%B8%B8%E6%95%B0%EF%BC%89%E5%9C%A8%5B-1.2%5D%E4%B8%8A%E6%9C%89%E6%9C%80%E5%B0%8F%E5%80%BC5%2C%E9%82%A3%E4%B9%88%E5%9C%A8%E6%AD%A4%E5%8C%BA%E9%97%B4%E4%B8%8A%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E6%98%AF%3F2%EF%BC%9ACOSASINC%2BCOSCSINA%2FSINASINC%3DSIN%28A%2BB%29%2FSIN%26sup2%3BB%3D1%2FSINB%E6%80%8E%E4%B9%88%E5%8C%96%E8%BF%87%E6%9D%A5%E7%9A%84%3F)
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