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    Prove sin50 + sin10 = sin70

    do u hav to use the sum-product identity thingy? cos i tried that but i cant figure it out.

    Some help pls. :rolleyes:
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    sin a + sin b = 2sin((a+b)/2)cos((a-b)/2)

    And cos x = sin(90-x)
 
 
 
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