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数学
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若sin(π+α)+sin(-α)=-m,则sin(3π+a)+2sin(2π-a)的值为?
人气:396 ℃ 时间:2020-01-29 23:53:31
解答
sin(π+α)+sin(-α)=-m
即-sina-sina=-m
sina=m/2
sin(3π+a)+2sin(2π-a)
=sin(2π+π+a)+2sin(-a)
=sin(π+a)+2sin(-a)
=-sina-2sina
=-3sina
=-3m/2
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