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5.4 Sum and
Difference Formulas
Essential Question:
How do you evaluate the exact value of a "non-special"
angle?

Standard: Trig 10.0




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5.4 Sum and Difference 
Formulas

Find the exact value:
sin 75°




                          2
Find the exact value:
sin 75°




                        3
Ex. 1﴿ Find the exact value of the following 
functions:

 tan 105°




 cos 11π/12




                                                4
Ex. 2﴿ Evaluate without a calculator.
cos 78°cos 18° + sin 78°sin 18°




Ex. 3﴿ Verify 




                                        5
Ex. 4﴿




         6
Assignment:

5.4 p. 404
#4, 7, 11, 14, 15, 25, 39, 41, 56, 61




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