(SIN X*COS X)/(1+SIN X+COS X)的值域?
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(SINX*COSX)/(1+SINX+COSX)的值域?(SINX*COSX)/(1+SINX+COSX)的值域?(SINX*COSX)/(1+SINX+COSX)的值域?设SINX+COSX=p则
(SIN X*COS X)/(1+SIN X+COS X)的值域?
(SIN X*COS X)/(1+SIN X+COS X)的值域?
(SIN X*COS X)/(1+SIN X+COS X)的值域?
设SIN X+COS X=p
则SIN X*COS X=(p^2-1)/2(上式两边平方)
原式=(p^2-1)/(2(1+p))=(p-1)/2
其中,-根号2
设sin(x)+cos(x)=t
sin(x)*cos(x)=(t²-1)/2
f(x)=(t-1)(t+1)/[2(t+1)]=(t-1)/2
因为t∈【-√2,√2】
所以f(x)∈【﹙-1-√2﹚/2,(-1+√2)/2】
PS:如有错误敬请指出。
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