是f(sin (x/2) )=1+cos x吧?
那么
f(sin (x/2) )=2-2sin(x/2)^2
所以f(x)=2-2x^2
所以f(cos (x/2) )=2-2cos (x/2)^2=1-cosx
设f(sin x/2 )-1+cos x ,求f(x)、f(cos x/2 ).
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