Question

Evaluate cos48୭ cos42୭ − sin48୭sin42୭​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

0

Step-by-step explanation:

Question :-

cos 48° ×cos 42° - sin 48°×sin42°

Identity used :-

sin A= cos(90°-A)

Solution :-

cos 48° ×cos 42° - sin 48°×sin42°

cos(90°-48°) ×cos(90°°-42°) - sin 48° ×sin 42°

sin 48° ×sin 42- sin 48° ×sin 42°

0

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