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# Re: Problems with Problems

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Posted by Louis Feng on December 27, 1998 at 11:34:27:

In Reply to: Problems with Problems posted by Jon on November 05, 1998 at 11:29:40:

Hi Jon,

I don’t know if you already forget, but you have gone to our web site—Trigonometric Identities at http://library.advanced.org/17119, and you have posted a question.

I weren’t able to check our site during that period. One of our friends sent us an email to notify me. so here is the answer.

csc^4A – cot^4A = csc^2A + cot^2A

L = (csc^2A + cot^2A)(csc^2A - cot^2A) (here csc^2a – cot^2A = 1)
= csc^2A + cot^2A

Hope this will help. Thanks for visiting our web site.

Best regards,

Louis
ThinkQuest team 17119

: I just can't seem to do anything to this trig identity
: function. The goal is to prove it as an identity.
: #1- (note- don't know how to do carat for exponents,
: will use ' for up arrow)
: csc'4A - cot'4A = csc'2A + cot'2A

: I just end up with cos'2A=1/2, can't prove it!!

: an email response would be appreciated.