Question

Evaluate in the simplest form :
(i) cos 60° cos 30° + sin 60° sin 30°
(ii) cos 60° cos 30° - sin 60° sin 30°​

Answer 1

Hey mate here's your answer

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Answer 2

Answer:

i) cos 60cos 30 + sin 60sin 30

Sol:- Cos 60 cos (90 - 30) + sin 60 sin (90 - 30)

Cos60sin60 + sin60cos60

By the identity

Cos theta sin theta = 1

So answer is 1

ii) Cos 60 cos 30 - sin 60 sin 30

This question can also be done by same procedure