Question

. Prove that
(i) sin (50° + 0) Cos (20° + O) - cos (50° + O) sin (20° + 8) =
(ii) cos (70° + O) cos (10° + 0) + sin (70° + O) sin (10° + 0) =
Prove that
(i) cos (n + 2)x cos (n + 1)x+ sin (n + 2)x sin (n + 1)x = COS X
(ii) cos ( - * cos ( - ) - sin ( 6 - x) sin (-y = sin (x + y)
COS
COS
4​

Answer 1

Step-by-step explanation:

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