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This is an old revision of this page, as edited by SineBot (talk | contribs) at 22:04, 23 October 2008 (Signing comment by 74.183.242.181 - "→9: new section"). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

${\displaystyle x=\tan \left(y\right)}$

${\displaystyle 1=\sec ^{2}\left(y\right)*{\frac {dy}{dx}}}$ (Chain rule, derivative of tan=sec^2)

${\displaystyle {\frac {1}{\sec ^{2}\left(y\right)}}={\frac {dy}{dx}}}$

${\displaystyle \cos ^{2}\left(y\right)={\frac {dy}{dx}}}$

${\displaystyle {\frac {dy}{dx}}=\cos ^{2}\left(y\right)}$

9

xy + xy = 6 —Preceding unsigned comment added by 74.183.242.181 (talk) 22:03, 23 October 2008 (UTC)