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Prove the following identities: sin10^...

Prove the following identities:
`sin10^(@) sin50^(@) + sin50^(@) sin 250^(@) + sin 250^(@) sin 10^(@) = -3/4`

Answer

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Knowledge Check

  • 2 sin 40^(@) sin 10^(@)=

    A
    `cos 30^(@) + cos 50^(@)`
    B
    `cos30^(@) - cos50^(@)`
    C
    `cos50^(@)- cos 30^(@)`
    D
    none of these

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