Back to Prove angle sum formulas — Problem 3 · 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
Work through problems with immediate feedback
A
Fluency Practice
1.
Use the addition formula to find the exact value of . Decompose . Express your answer as a single simplified fraction with a radical numerator.