求sin4π/3,tan(-5π/4)的值

题目

求sin4π/3,tan(-5π/4)的值

答案

sin4π/3
=sin(π+π/3)
=-sinπ/3
=-√3/2
tan(-5π/4)
=tan(-π-π/4)
=tan(-π/4)
=-tanπ/4
=-1
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