Re: Problems with Problems

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Comments:	: 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.
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