一个角α的终边过点p(sin5π/3,cos5π/3)则sin(π+α)等于多少？
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sin(π+α)
=-sinα
=-cos(5π/3)/√[sin^2(5π/3)+cos^2(5π/3)]
=-cos(5π/3)
=cos(2π/3)
=-1/2
=-sinα
=-cos(5π/3)/√[sin^2(5π/3)+cos^2(5π/3)]
=-cos(5π/3)
=cos(2π/3)
=-1/2
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