(cos4π5)*(tan11π6)*(sin5π4)=
(cos(π-π5))*(tan(2π-π6))*(sin(π+π4)
=-cos(π5)*(tanπ6)*(sinπ4)
=-√6/6cos(π5)
(cos4π\5)*(tan11π\6)*(sin5π\4)
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