Trigonometric Functions of Acute Angles | Cofunction Identities

In this lesson, we will learn how to define our six trigonometric functions as ratios of the lengths of the sides of a right triangle. Additionally, we will learn how to use SOH-CAH-TOA to remember these ratios. SOH tells us that sin is opposite/hypotenuse, CAH tells us that cos is adjacent/hypotenuse, and TOA tells us that tan is opposite/adjacent. Lastly, we will learn about cofunction identities and learn how to solve basic equations that involve cofunction identities.

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