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Trignometry

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18 Mar 2010 22:05:45 IST

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How 2 convert (sin theta/2) into (sin theta) plz eplain the method n principle behind it

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How 2 convert (sin theta/2) into (sin theta) plz eplain the method n principle behind it

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Nehal Wani

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Joined: 19 Jul 2009

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19 Mar 2010 07:00:37 IST

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Cosθ= 1-2sin²θ/2

Sin²θ=1-cos²θ =1-(1-2sin²θ/2)²

Sinθ=[1-(1-2sin²θ/2)²]^1/2

rahulmishra

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Joined: 16 Jan 2010

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7 Apr 2010 23:25:30 IST

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That's really east :-

We know that,
Sin 2A = 2 Sin A. Cos A
=> Sin A = 2 Sin A/2 . cos A/2
=> Sin A = 2 Sin A/2. √(1 - sin²A/2)
and that's the answer

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