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Sum and difference identities — Homework
Break each angle into a sum or difference of 30, 45, or 60 degrees before applying an identity.
- 1.Find the exact value of cos(15 degrees) using 15=45-30.
- 2.Find the exact value of sin(105 degrees) using 105=60+45.
- 3.Find the exact value of tan(75 degrees) using 75=45+30.
- 4.Explain why sin(A+B) is generally NOT equal to sin(A)+sin(B), using A=30 degrees and B=60 degrees as a counterexample.
- 5.Use the cosine difference formula to find the exact value of cos(pi/12).
🌲 Homeschool of the FutureTwelfth Grade · Math · week 22 homework