Question

Please proved it immediately ​

Answer 1

For finding the values of sin 15º and cos 15°, we can split 15° into two angles such that,

15° = 45° - 30°

  

or we also can split 15° as 15° = 60° - 45°

You can use either way, answer won't change.

Formula to use for calculating this value is already given in the question,

sin(A - B) = sin A cos B - cos A sin B           (1)

cos(A - B) = cos A cos B + sin A sin B          (2)

Put A = 60° and B = 45°

A - B = 15°

Now put the values in formula 1 and 2,



And,



Thus we have,



Answer 2

Answer:

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