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    prawn Posts: 1, Reputation: 1
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    #1

    Apr 25, 2012, 11:03 PM
    how to prove
    prove : 1/cotA + cosecA = cotA - cosecA
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    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Apr 26, 2012, 06:31 AM
    Quote Originally Posted by prawn View Post
    prove : 1/cotA + cosecA = cotA - cosecA
    Your formula has an error:



    However, the following is true:



    To prove it start by replacing the cot(A) and csc(A) functions with their sine and cosine equivalents, then simplify - for example on the left hand side multiply numerator and denominator by sin(A).
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