(sin2x+4)/(cosx+1)=2.(cosx+3)(sinx+1)的值是?
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![(sin2x+4)/(cosx+1)=2.(cosx+3)(sinx+1)的值是?](/uploads/image/z/1267452-36-2.jpg?t=%28sin2x%2B4%29%2F%28cosx%2B1%29%3D2.%28cosx%2B3%29%28sinx%2B1%29%E7%9A%84%E5%80%BC%E6%98%AF%3F)
(sin2x+4)/(cosx+1)=2.(cosx+3)(sinx+1)的值是?
(sin2x+4)/(cosx+1)=2.(cosx+3)(sinx+1)的值是?
(sin2x+4)/(cosx+1)=2.(cosx+3)(sinx+1)的值是?
(sinx)^2+4]/(cosx+1)=2,
(sinx)^2+4=2cosx+2,
1-(cosx)^2+4=2cosx+2,
(cosx)^2+2cosx-3=0,
cosx=-3(舍去),
cosx=1,此时sinx=0,
(cosx+3)(sinx+1)=4.