反正切函数在单位圆上的定义
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①本范例通过单位圆演示反正切函数的定义,展示了角度与对应直角三角形斜边的比例关系;②涉及核心数学概念包括单位圆、三角函数、反正切函数、直角三角形相似性;③作图要点:使用Point, Intersect, Circle, Segment, OrthogonalLine, Sequence, Vector, Line, Ray, CircleArc, Angle等命令构建图形;④适合高中数学学生学习和理解反正切函数的几何意义及定义域。
GeoGebra 命令及参数
Point(f_1) → RPoint(xAxis) → NPoint(yAxis) → DIntersect(xAxis, yAxis) → ACircle(A, B) → cSegment(A, C) → aSegment(B, A) → bOrthogonalLine(C, yAxis) → dSegment(D, A) → hSegment(H, B) → iSequence((-1.5, t), t, -87.96459430051421, 87.96459430051421, 0.2617993877991494) → tvalVector(C, K) → jVector(A, L) → kSegment(B, L) → lLine(L, B) → nSegment(T_0, t_2) → pRay(A, B) → qRay(A, C) → rCircleArc(A, B, C) → eVector(C, t_2) → w_2Vector(D, C) → u_3CircleArc(A, C, B) → sVector(F, E) → v_2OrthogonalLine(N, i) → c_1Intersect(e, c, 1) → OVector(N, O) → uIntersect(c, c_1, 2) → PVector(N, P) → vCircleArc(A, B, P) → d_1Vector(P, Q) → wRay(A, P) → e_1Segment(R, A) → g_1Intersect(c, d_1) → S, , ,Intersect(c, g_1) → T,CircleArc(A, B, T) → h_1Vector(R, T) → u_1Angle(B, A, T) → εVector(T, U) → v_1Segment(A, P) → j_1Segment(T_0, Q) → k_1CircleArc(A, B, T) → p_1Vector(V, W) → w_1Vector(W, J) → zVector(W, M) → mSequence((0, k), k, -1, 1, 0.5) → list1Sequence((1, k), k, -1, 1, 0.5) → list2Sequence((2, k), k, -1, 1, 0.5) → list3CircleArc(A, T, B) → q_1Angle(T, A, B) → δ