Q

Asked by araima2001 | 8th Dec, 2015, 08:33: AM

Expert Answer:

begin mathsize 16px style cos space 15 equals cos left parenthesis 45 minus 30 right parenthesis equals cos 45. cos 30 plus sin 45. sin 30 equals fraction numerator 1 over denominator square root of 2 end fraction cross times fraction numerator square root of 3 over denominator 2 end fraction plus fraction numerator 1 over denominator square root of 2 end fraction cross times 1 half equals fraction numerator square root of 3 over denominator 2 square root of 2 end fraction plus fraction numerator 1 over denominator 2 square root of 2 end fraction equals fraction numerator square root of 3 plus 1 over denominator 2 square root of 2 end fraction end style

Answered by Rashmi Khot | 8th Dec, 2015, 09:03: AM