Prove that sin(a) + sin(a+h) + sin(a+2h) +.........+ sin(a+(n-1)h) = (sin(nh/2) sin(a+(n-1)h/2)/sin(h/2)

You can use mathematical induction to get it proved
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Plz give me answer

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Prove that sin(a) + sin(a+h) + sin(a+2h) +.........+ sin(a+(n-1)h) = (sin(nh/2) sin(a+(n-1)h/2)/sin(h/2)
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Sina+sin(a+h) + .... +sin(a+(n-1)h)
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