数学高手来!高一的题.

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数学高手来!高一的题.数学高手来!高一的题.数学高手来!高一的题.f(cosx)=f(sin(90-x))=sin[(4n+1)(90-x)]=sin[90-(4n+1)x]=cos[(4n+1)x]

数学高手来!高一的题.
数学高手来!高一的题.

数学高手来!高一的题.
f(cosx)=f(sin(90-x))
=sin[(4n+1)(90-x)]
=sin[90 -(4n+1)x]
=cos[(4n+1)x]

f(cosx)=f[sin(π/2-x)]=sin[(4n+1)(π/2-x)]=sin[(4n+1)(π/2)-(4n+1)x]
=sin[(2π+π/2-(4n+1)x]=sin[π/2-(4n+1)x]=cos[(4n+1)x]