Question: Problems 7180 are based on previously learned material. The purpose of these problems is to keep the material fresh in your mind so that you

Problems 71–80 are based on previously learned material. The purpose of these problems is to keep the material fresh in your mind so that you are better prepared for later sections, a final exam, or subsequent courses such as calculus.

Find the exact value of7 [cos- (-3) ]- COS-1 8. tan

7 [cos- (-3) ]- COS-1 8. tan

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