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求证 tan(2π-X)sin(-2π-X)cos(6π-X)/ sin(X+3π/2)*cos(X+3π/2)=-tanX
人气:153 ℃ 时间:2020-03-14 09:32:14
解答
tan(2π-x) sin(-2π-x) cos(6π-x) / sin(x+3π/2)*cos(x+3π/2)
=(-tanx) (-sinx) cosx / (-cosx) sinx
=-tanx
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