f（cosx）=cos17x .证明f（sinx）=sin17x

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f（cosx）=cos17x.证明f（sinx）=sin17xf（cosx）=cos17x.证明f（sinx）=sin17xf（cosx）=cos17x.证明f（sinx）=sin17xf(sinx)

f（cosx）=cos17x .证明f（sinx）=sin17x
f（cosx）=cos17x .证明f（sinx）=sin17x

f（cosx）=cos17x .证明f（sinx）=sin17x
f(sinx)
=f[cos(π/2-x)]
=cos[17(π/2-x)]
=cos(4×2π+π/2-17x)
=cos(π/2-17x)
=sin17x