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sin50-sin70+sin10=

sin50-sin70+sin10=

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1 Answers

Y RAJYALAKSHMI
45 Points
8 years ago
2.cos(50+70)/2 * sin(50-70)/2 + sin10  (use sin A – sin B = 2 cos (A+B)/2 * sin (A-B)/2
2.cos60 sin(-10) + sin10
2*1/2 * (-sin10) + sin10
-sin10 + sin10 = 0

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