cos(-8π/3)求值

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cos(-8π/3)求值cos(-8π/3)求值cos(-8π/3)求值cos(-8π/3)=cos(-8π/3+2π)=cos(-2π/3)=-cos(-2π/3+π)=-cos(π/3)=-1/2

cos(-8π/3)求值
cos(-8π/3)求值

cos(-8π/3)求值
cos(-8π/3)
=cos(-8π/3+2π)
=cos(-2π/3)
=-cos(-2π/3+π)
=-cos(π/3)
=-1/2