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    ashin's Avatar
    ashin Posts: 1, Reputation: 1
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    #1

    Sep 16, 2011, 07:19 PM
    To prove lhs = rhs in trignometric equations?
    Sec(a)^2+cot^2(90-a)=2cosec^2(90-a)-1
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Sep 17, 2011, 08:47 AM
    Please, do show us what you have tried. Remove all the compound angles to put everything in terms of a. Then, converting everything to sine and cosine is usually much easier.
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