cos(3π/2 - π/3),求值

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cos(3π/2 - π/3),求值
cos(3π/2 - π/3),求值

cos(3π/2 - π/3),求值
解cos(3π/2 - π/3)
=cos(π+π/2 - π/3)
=-cos(π/2 - π/3)
=-sin（π/3)
=-√3/2.

-√3/2