题目内容
15.若f(x)=asin(x+

-3
解析:a=-3.观察易得a=-3
由y=-3sin(x+)+3sin(x-
)
=-3cos(x-)+3sin(x-
)
=-3[cos(x-)-sin(x-
)]
=-3[
cos(x-
)-
sin(x-
)]
=-3cosx 为偶函数.

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题目内容
15.若f(x)=asin(x+
-3
解析:a=-3.观察易得a=-3
由y=-3sin(x+)+3sin(x-
)
=-3cos(x-)+3sin(x-
)
=-3[cos(x-)-sin(x-
)]
=-3[
cos(x-
)-
sin(x-
)]
=-3cosx 为偶函数.