Lesson 23 – Secondary Trigonometric Functions & Inverse Trig Functions

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Lesson 23 – Secondary Trigonometric Functions & Inverse Trig Functions IB Math HL 11/24/2018 Math HL

Lesson Objectives 1. Relate the features of sinusoidal curves to modeling periodic phenomenon 2. Transformations of sinusoidal functions and their features 11/24/2018 Math HL

Working with Graphs of the Secondary Trig Functions (a) Sketch 2 cycles of the graph of y = sin(x) (b) Hence, sketch y = csc(x) & label key features (asymptotes, max/min, x- & y-int) (c) Hence, sketch 2 cycles of y = 2csc(2x) – 4 and label key features (asymptotes, max/min, x- & y-int. 11/24/2018 Math HL

Working with Graphs of the Secondary Trig Functions (a) Sketch a graph of two periods of f(x) = 2 + cos(x) (b) Sketch a graph of two periods of g(x) = -sec(x) (c) How many solutions would you predict for the system f(x) = g(x)? Find the exact values of these solutions 11/24/2018 Math HL

Advanced Sinusoidals Predict the domains of the following composite functions 11/24/2018 Math HL

Review of Inverse Functions Q  What is the significance of a function being 1:1 in the context of inverse functions? Q  Is f(x) = x2 a 1:1 function? Q  How did we “resolve” this issue with the function f(x) = x2? 11/24/2018 Precalculus - Santowski

Precalculus - Santowski Restricted Domains (a) How would you restrict the domain of g(x) = sin(x) so that its inverse is a function? Use your calculator to justify your choice. (numerically & graphically) (b) How would you restrict the domain of g(x) = cos(x) so that its inverse is a function? Use your calculator to justify your choice. (numerically & graphically) (c) How would you restrict the domain of g(x) = tan(x) so that its inverse is a function? Use your calculator to justify your choice. (numerically & graphically) 11/24/2018 Precalculus - Santowski

Graphs of Trig Inverse Functions: x = sin(y) 11/24/2018 Precalculus - Santowski

Graphs of Trig Inverse Functions: y = sin-1(x) 11/24/2018 Precalculus - Santowski

Graphs of Trig Inverse Functions: x = cos(y) 11/24/2018 Precalculus - Santowski

Graphs of Trig Inverse Functions: y = cos-1(x) 11/24/2018 Precalculus - Santowski

Graphs of Trig Inverse Functions: x = tan(y) 11/24/2018 Precalculus - Santowski

Graphs of Trig Inverse Functions: y = tan-1(x) 11/24/2018 Precalculus - Santowski