# Trigo help!

posted by .

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! -

When 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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