Simplifying Radicals Mini-lesson

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5.4 Sum and Difference Formulas

Find the exact value:sin 75°

Find the exact value:sin 75°

Ex. 1) Find the exact value of the following functions:

tan 105°

cos 11π/12

Ex. 2) Evaluate without a calculator.cos 78°cos 18° + sin 78°sin 18°

Ex. 3) Verify

Ex. 4)

Assignment:

#24 p. 404#4, 7, 11, 14, 25, 38, 56, 58, 61