This is part of the HSC Mathematics Advanced course under the topic Trigonometric Functions and sub-part Trigonometric Functions and Graphs.
In this post, we will learn how to solve trigonometric equations involving functions of the form kf(a(x+b)) + c , using technology or otherwise, within a specified domain.
Khan Academy: Midline, amplitude and period of a function
Writing Trigonometric Equations From The Graph & Solving Word Problems
https://www.youtube.com/watch?v=Y8XlieOhyHs