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Verify
c.ram13
Jun 8, 2011, 04:48 PM
verify 2x-tanx=tanx sec 2x
ebaines
Jun 9, 2011, 05:55 AM
verify 2x-tanx=tanx sec 2x
You have an error in your formula - for most values of x the two sides are not equal:
2x - \tan(x)\ \ne \ \tan (x) \sec (2x)