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Trignometry

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 Joined: 3 Mar 2012 Post: 1
3 Mar 2012 19:36:43 IST
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Engineering Entrance , JEE Main , JEE Main & Advanced , Mathematics , Trigonometry

cos2A=2sinAcosA

Scorching goIITian

Joined: 20 Jul 2011
Posts: 256
3 Mar 2012 20:38:26 IST
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Its not cos2A that equals to 2sinAcosA .

sin2A=2sinAcosA

Taking L.H.S

sin2A

sin(A+A)

sinAcosA + sinAcosA

2sinAcosA = R.H.S

Hence proved......

Blazing goIITian

Joined: 2 Mar 2012
Posts: 308
4 Mar 2012 17:04:20 IST
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Beta MUMMY ko bolo complan pilaye...

Blazing goIITian

Joined: 30 Aug 2011
Posts: 359
13 Mar 2012 21:52:46 IST
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saath me mentos khao

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Joined: 28 Nov 2011
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2 Apr 2012 12:40:42 IST
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cos2A= cos^2A-sin^2A = 2cos^2A-1 = 1-2sin^2A

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Joined: 28 Nov 2011
Posts: 25
2 Apr 2012 12:41:13 IST
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cos2A= cos^2 A-sin^2 A = 2cos^2 A-1 = 1-2sin^2 A

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