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January 21, 2017
Posted by **Kim** on Wednesday, March 23, 2011 at 11:40am.

cos x + sin x tan x = sec x.

- Pre Calculus -
**Reiny**, Wednesday, March 23, 2011 at 12:09pmLS

= cosx + sinx(sinx/cosx)

= (cos^2x + sin^2x)/cosx , common denominator is cosx

= 1/cosx

= secx

= RS