(tan x)(1-cot x)

Here's what I tried:

Sin/cos(1-cos/sin)

--That obviously didn't work

cos x/1-sin x=sec x + tan x

I don't really know how to begin on this one.

Any hints and help is appreciated. Thanks in advance.

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- Apr 1st 2008, 10:47 AMbeetzHelp proving trig identities.
(tan x)(1-cot x)

Here's what I tried:

Sin/cos(1-cos/sin)

--That obviously didn't work

cos x/1-sin x=sec x + tan x

I don't really know how to begin on this one.

Any hints and help is appreciated. Thanks in advance. - Apr 1st 2008, 10:56 AMJhevon
of course it didn't work, there's no identity here! what should you be proving?

Quote:

cos x/1-sin x=sec x + tan x

multiply through by $\displaystyle \frac {1 + \sin x}{1 + \sin x}$ and simplify

and use parentheses next time to clarify what you mean. you should have typed (cos x)/(1 - sin x). here it was easy to see what you meant, but it won't always be