Question

If sin (A - B) = sin A cos B-cos A sin B and cos (A - B) = cos A cos B + sin A sin B, find the
values of sin 15° and cos 15º.
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Answer 1

Answer:

Step-by-step explanation:

sin15=sin(45-30)

=sin45cos30-cos45sin30

=1/root2*root3/2-1/root2*1/2

=root3-1/2root2

=cos15=cos(45-30)

=cos45cos30+sin45sin30

=root3+1/2root2