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August 21, 2014

August 21, 2014

Posted by **help!** on Saturday, September 19, 2009 at 9:24am.

Prove the following:

secY(1+tanY)=6cosecY

my workings:

LeftHandSide:

secY + tanY/cosY

= 1/cosY + sinY/cos^2Y

=(cosY+sinY)/cos^2Y

= ???

How should i attempt this question?? Am i even on the right track? Please help, much appreciated!

- Trigo help! -
**Reiny**, Saturday, September 19, 2009 at 10:01amWhen I come across an unusual trig identity to prove, the first thing I do is try some arbitrary angle.

Since it is an Identity it should be true for any angle

e.g. Y = 30º

LS = sec30(1+tan30) = appr. 1.821

RS = 6csc30 = 12

No wonder you can't prove it, it is not true !

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