Maximum and minimum can be found from the vertical shift and the amplitude. Their sum is maximum and difference is minimum.
You can always check your answer by finding the average of maximum and minimum. It should be equal to the vertical shift.
How to write equation of trigonometric function from the given graph
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Transformation Trigonometric Function: • Trigonometric Function Graph and Tran...
MHF4U Advanced Functions is a popular course in Canada where this is in Chapter 66. The concept is very important for higher level mathematics specially Calculus.
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