∵sin（x+π/6）=sinxcosπ/6+cosxsinπ/6
=（√3/2）sinx+（1/2）cosx,
cos（x-π/3）=cosxcosπ/3+sinxsinπ/3
=（1/2）cosx+（√3/2）sinx.
∴相等.
cos(x-π/3)=sin(x+π/6)这两者相等吗?
1个回答
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