Example 15;
ITA+B+C = r, prove that
(1) sin 2A + sin 2B + sin 2C = 4 sin A, sin B. sin C
A cos B. sin
cos A + cos B - cos C = 4 cos
2
2
sin A + sin’B + sin( – 2 cos A. cos B. cos C = 2
TI - B
cos
COS
(iv) cosŻA - cos į B + cos c = 4 cos #A
T+C
4
4
Answers
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Explanation:
cos A 1 +3+5+7
Costa جسیجھ دسال
t+c
4
4
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