How can i prove cos2x derivation using cos x by basic derivation proof.... like (limit and delta(x) delta(y))

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- January 6th 2014, 08:49 PMsrirahulancos2x
How can i prove cos2x derivation using cos x by basic derivation proof.... like (limit and delta(x) delta(y))

- January 6th 2014, 08:58 PMromsekRe: cos2x
just expand out and take the limit as .

- January 6th 2014, 09:16 PMsrirahulanRe: cos2x
but i asked to use cos2x proofing by cosx... i tried this way,,, cos2x=2cos^2(x)-1, and then expand, finally i stacked up.... please give me a solution????

- January 6th 2014, 10:14 PMromsekRe: cos2x
- January 6th 2014, 10:48 PMProve ItRe: cos2x
- January 13th 2014, 09:18 PMibduttRe: cos2x