Back to Prove angle sum formulas — Problem 2 · Task Set 80
Exercises: Prove Angle Addition Formulas for Sine, Cosine, and Tangent
Show all steps for each problem. Express exact values as fractions or simplified radicals (do not give decimal approximations unless the problem asks for one).
Grade 9·23 problems·~35 min·Common Core Math - HS Functions·group·hsf-tf-c-9
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Warm-Up: Review What You Know
These problems review skills from earlier lessons.
1.
What is the exact value of ?