Trignometry

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

cos2A=2sinAcosA



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Sumiran agrawal's Avatar

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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......

kartikAIR1's Avatar

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4 Mar 2012 17:04:20 IST
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Beta MUMMY ko bolo complan pilaye...
sudhindra shenoy's Avatar

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13 Mar 2012 21:52:46 IST
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 saath me mentos khao

Kriti Sinha's Avatar

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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
Kriti Sinha's Avatar

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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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