As promised, here is a quick demo of how to find a zero of a function using your TI graphing calculator: (ie solving the equation 2sin x + 1 = 0)

And here is one that demos finding the intersection between a function and a horizontal line: (ie solving the equation 2sin x + 1 = 2.1)

And in honour of π day, of course, I give you Lady Vihart:

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