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Prove that sin 10^(@) + sin 50^(@)-sin...

Prove that
`sin 10^(@) + sin 50^(@)-sin70^(@)=0`

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Prove that, sin10^(@)+sin50^(@)-sin70^(@)=0

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(i) sin10^(@)sin50^(@)sin70^(@)

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Prove that sin10^(@) + sin20^(@) + sin 40^(@) + sin 50^(@) = sin 70^(@) + sin 80^(@)