Question

$\sf\:sin\:20°\:+\:sin\:40°-\: sin 80°$

Answer: 0

Answer 1

sin20 + sin40 = 0.984 - sin 80 = 0
hope this will help you

Answer 2

Heya mate
The answer of ur question is



♢ Sin 20 ° + Sin 40 ° - Sin 80 ° = 0
Let's see how


On taking L.H.S.
L .H.S. = sin20+ sin40 - sin 80 
= 2 sin(20+40)/2 cos (40-20)/2 - sin80 
= 2 sin30 cos10 - sin 80 
=2x1/2 cos10 - sin80 
= cos10 - sin(90- 10) 
=cos10 - cos10 
= 0


Hence Now L.H.S = R.H.S


So , Sin 20 + Sin 40 - Sin 80 = 0
Hence proved



hope it helps