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Trignometry

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4 Apr 2008 14:38:03 IST

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304

Arihant trigo problem

None

Prove that 4sin 27 degree= (5+root 5)^1/2-(3-root 5)^1/2.

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jugnu

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Joined: 31 Mar 2008

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5 Apr 2008 07:21:26 IST

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Please give the answer of my question

Decoder

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Joined: 1 Apr 2007

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5 Apr 2008 09:02:05 IST

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xavier wat's ur ques. ???

back to this thread..

u noe wat is cos18...
now from there u will know wat is sin9 .. root.( 1-cos2x / 2 )..

from there put this thing in this expression..
3sin9 - 4(sin^3)9 = sin27..

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