三角函数图像自学交互工具
几何画板及绘图内容加载中,请稍等……
① 该示例通过输入框动态调整上下限,展示正弦、余弦与正切函数的图像变化与导数关系;② 涉及三角函数图像、一阶导数、二阶导数、极值点与切线构造等核心概念;③ 构造过程中运用了 If、Derivative、Intersect、Sequence、Point、Vector 等 GeoGebra 命令,以及转折点列表、均线、中线等对象,实现函数图像的动态交互;④ 适合高中函数模块与大学微积分入门阶段的图像分析与导数概念教学。
GeoGebra 命令及参数
If(angledegree, (lowerlimit_d * pi / 180), lowerlimit_r) → lowerlimitIf(angledegree, upperlimit_d / 180, upperlimit_r) → upperlimitFunction(g_{hidden}, (lowerlimit * pi), (upperlimit * pi)) → gDerivative(g_{hidden}) → g'RemoveUndefined(Sequence[x(Root[g', i]), i, -31.41593, 31.41593, 0.31416]) → sincosturningptslistgFunction(f_{hidden}, (lowerlimit * pi), (upperlimit * pi)) → fDerivative(f_{hidden}) → f'RemoveUndefined(Sequence[x(Root[f', i]), i, -31.41593, 31.41593, 0.31416]) → sincosturningptslistfPoint(g) → P_{02}Point(f) → P_{01}If(Length[sincosturningptslistg] > 0, false, true) → gchecktanfunction2Derivative(g') → g''Derivative(f') → f''If(Length[sincosturningptslistf] > 0, false, true) → fchecktanfunction1Textfield(f_{hidden}) → inputBox1Textfield(g_{hidden}) → inputBox4Sequence(Text[i + "°", ((pi / 180 * i) - 0.05, -0.3)], i, 0, 1080, 90) → listxaxisdegreesby90If(fchecktanfunction1 ≟ false, (y(Max[f, (lowerlimit * pi), ((upperlimit * pi) * 10)]) + y(Min[f, (lowerlimit * pi), ((upperlimit * pi) * 10)])) / 2, meanline_{1fortan}) → meanline_1If(gchecktanfunction2 ≟ false, (y(Max[g, (lowerlimit * pi), ((upperlimit * pi) * 10)]) + y(Min[g, (lowerlimit * pi), ((upperlimit * pi) * 10)])) / 2, meanline_{2fortan}) → meanline_2Textfield(h_{hidden}) → inputBox5Function(h_{hidden}, (lowerlimit * pi), (upperlimit * pi)) → hFunction(meanline_1, (lowerlimit * pi), (upperlimit * pi)) → f_{meanline1}Function(meanline_2, (lowerlimit * pi), (upperlimit * pi)) → g_{meanline2}Textfield(lowerlimit_d) → inputBox6Textfield(upperlimit_d) → inputBox7Function(0, (lowerlimit * pi), (upperlimit * pi) + 1) → h_{x-axis}Textfield(upperlimit_r) → inputBox3Textfield(lowerlimit_r) → inputBox2Sequence(Text[FractionText[i] + "π", ((pi * i) - 0.15, -0.1), true, true], i, lowerlimit + xunitdistance, upperlimit, xunitdistance) → listxaxisradianlabelTextfield(xaxisnumdivquad) → inputBox8Sequence((i, 0), i, (lowerlimit * pi), (upperlimit * pi), (xunitdistance * pi)) → listxaxisticksSequence(abs(f(i)), i, (lowerlimit * pi), (upperlimit * pi), 0.01) → valuestanfunction, {2, 1.999400019999733, 1.9976003199829337, 1.9946016198056125, 1.9904051189078582, 1.9850124958340776, 1.9784259075615989, 1.9706479886379116, 1.961681850126881, 1.9515310783643645, 1.940199733523725, 1.9276923479918167, 1.9140139245560892, 1.8991699344035395, 1.8831663149323132, 1.8660094673768182, 1.8477062542473224, 1.8282639965850387, 1.8076904710338044, 1.785993906729531, 1.7631829820086553, 1.7392668209369249, 1.71425498965989, 1.6881574925765754, 1.6609847683378525, 1.6327476856711178, 1.6034575390329495, 1.573126044091472, 1.541765333040248, 1.5093879497455607, 1.4760068447290347, 1.4416353699876012, 1.406287273652877, 1.3699766944920948, 1.3327181562527834, 1.294526561853465, 1.2554171874226845, 1.2154056761887633, 1.174508032222715, 1.1327406140368312, 1.0901201280414954, 1.04666362186284, 1.0023884775239233, 0.9573124044921548, 0.9114534325957395, 0.8648299048119923, 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0.21795144361054497, 0.27253702201099106, 0.3266136025694495, 0.38015955537482604, 0.4331534627599347, 0.4855741278683974, 0.5374005831331037, 0.5886120986629577, 0.6391881905345591, 0.6891086289854975, 0.7383534465059904, 0.7869029458256174, 0.8347377077919691, 0.8818385991380473, 0.9281867801353174, 0.9737637121293474, 1.0185511649550247, 1.0625312242283762, 1.1056862985120866, 1.1479991263518343, 1.1894527831806485, 1.230030688088505, 1.2697166104544717, 1.308494676438742, 1.3463493753319549, 1.3832655657592765, 1.4192284817367447, 1.4542237385774683, 1.4882373386453076, 1.5212556769537442, 1.553265546607694, 1.5842541440860867, 1.6142090743631083, 1.6431183558660405, 1.6709704252677344, 1.697754142111786, 1.723458793268568, 1.7480740972203428, 1.7715902081737283, 1.793997719997888, 1.815287669986855, 1.835451542444496, 1.8544812720906751, 1.8723692472872613, 1.8891083130826782, 1.9046917740737932, 1.9191133970839855, 1.9323674136563378, 1.9444485223609385, 1.9553518909153844, 1.9650731581176313, 1.9736084355904122, 1.9809543093365414, 1.9871078411044634, 1.9920665695635171, 1.9958285112884342, 1.998392161552684, 1.9997564949303417}Asymptote(f) → list5Asymptote(Function[g, (lowerlimit * pi), (upperlimit * pi)]) → list6If(fchecktanfunction1 ≟ false, y(Max[f, (lowerlimit * pi), ((upperlimit * pi) * 10)]), 0) → maxline_1If(fchecktanfunction1 ≟ false, y(Min[f, (lowerlimit * pi), ((upperlimit * pi) * 10)]), 0) → minline_1Function(maxline_1, (lowerlimit * pi), (upperlimit * pi)) → f_{maxline1}Function(minline_1, (lowerlimit * pi), (upperlimit * pi)) → f_{minline1}Intersect(f_{maxline1}, vertline1) → A_1Intersect(f_{minline1}, vertline1) → B_1Intersect(f_{meanline1}, vertline1) → C_1Distance(A_1, C_1) → distanceA1C1Vector(C_1, A_1) → u_1Vector(C_1, B_1) → v_1Midpoint(A_1, C_1) → M_{A1C1}Midpoint(B_1, C_1) → M_{C1B1}If(gchecktanfunction2 ≟ false, y(Max[g, (lowerlimit * pi), ((upperlimit * pi) * 10)]), 0) → maxline_2If(gchecktanfunction2 ≟ false, y(Min[g, (lowerlimit * pi), ((upperlimit * pi) * 10)]), 0) → minline_2Function(maxline_2, (lowerlimit * pi), (upperlimit * pi)) → g_{maxline1}Function(minline_2, (lowerlimit * pi), (upperlimit * pi)) → g_{minline1}Intersect(g_{maxline1}, vertline2) → A_2Intersect(g_{minline1}, vertline2) → B_2Intersect(g_{meanline2}, vertline2) → C_2Midpoint(A_2, C_2) → M_{A2C2}Midpoint(B_2, C_2) → M_{B2C2}Distance(A_2, C_2) → distanceACVector(C_2, A_2) → u_2Vector(C_2, B_2) → v_2If(fchecktanfunction1, tancyclesf, sincoscycles1) → cycles1If(gchecktanfunction2, tancyclesg, sincoscycles2) → cycles2Intersect(g, vertline3, (0, -1.5)) → P_1Midpoint(P_1, Q_1) → M_{P1Q1}Vector(M_{P1Q1}, P_1) → u_{p1l}Vector(M_{P1Q1}, Q_1) → u_{p1r}Intersect(f, vertline4, (0.08997312945277669, 1.9515599378378266)) → P_2Midpoint(P_2, Q_2) → M_{P2Q2}Vector(M_{P2Q2}, Q_2) → u_{p2r}Vector(M_{P2Q2}, P_2) → u_{p2l}Derivative(f'') → f'''Derivative(g'') → g'''Sequence(Text[i + "°", ((pi / 180 * i) - 0.15, -0.55)], i, (lowerlimit * 180) + (180 * xunitdistance), (upperlimit * 180), (180 * xunitdistance)) → listxaxisdegreesby45