Question

271
11
ba
177
b
A.
+
=
B.
772 71
D.
+
12 177
=
ΤΣ
771
IC
27
Sac
127
72
172
CI
b
cos? 5° + cos-15° - cos- 25 + ---- cos-355"
A. 18
B. 19
C. 27
D. 36​

Answer 1

Answer:

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Step-by-step explanation:

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