A.sin19x B.cos19x C.-sin19x D.-cos19x

admin2022-08-02  17

问题 A.sin19xB.cos19xC.-sin19xD.-cos19x

选项 A.sin19x
B.cos19x
C.-sin19x
D.-cos19x

答案 C

解析 f(cosx)=f[sin(90°-x)]=cos19(90°-x)=cos(270°-19x)=-sin19x.
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