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已知角α终边上的一点p(-4,3) cos(π/2+α)sin(-π-α)/cos(11π/2-α)sin(9π/2+α)
人气:443 ℃ 时间:2020-03-25 08:22:21
解答
cos(π/2+α)sin(-π-α)/cos(11π/2-α)sin(9π/2+α)
=-sina*sina/(-sina)cosa
=tana
tana=/4/3
cos(π/2+α)sin(-π-α)/cos(11π/2-α)sin(9π/2+α)=-4/3
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