Use the identity of Exercise 48 to show that cos /8 is equal to 1/2 + 2/4.
Question:
Use the identity of Exercise 48 to show that cos π/8 is equal to √1/2 + √2/4.
Data From Exercise 48
Derive the identity using the identities listed in this section.
cos2 θ/2 = 1 + cos θ/2
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