Math, asked by rahullyagala666, 9 months ago

sin 20° + sin 40° - sin 80º =

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Answered by Anonymous

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=sin60°-sin80°

=-sin20°

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Answered by itzlisa91331

Answer:

Step-by-step explanation:

sin 20° + sin 40° - sin 80°

= sin 40° + sin 20° - sin 80°m; apply sum of sines

= 2 sin 60° cos 20° - sin (60° + 20°); expand compound angle

= 2 sin 60° cos 20° - [sin (60°) cos 20° + cos (60°) sin 20°]

= 2 sin 60° cos 20° - sin (60°) cos 20° - cos (60°) sin 20°

= sin 60° cos 20° - sin (60°) cos 20°

= 0

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sin 20° + sin 40° - sin 80º =​

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sin 20° + sin 40° - sin 80º =