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    jetter12's Avatar
    jetter12 Posts: 1, Reputation: 1
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    #1

    May 29, 2012, 03:10 PM
    trigonometric identities solver
    could someone please tell me how to verify this identity, I'm having a hard time figuring this stuff out:

    cot(-x) cos(-x) + sin(-x) = -cscx
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    May 30, 2012, 06:07 AM
    Quote Originally Posted by jetter12 View Post
    could someone please tell me how to verify this identity, i'm having a hard time figuring this stuff out:

    cot(-x) cos(-x) + sin(-x) = -cscx
    As usuall with proving trig identities first convert the cot(-x) and csc(x) functions to their sine and cosine equivalents. Then recall that sin(-x) = -sin(x) and cos(-x) = cos(x). Take a stab at it and if you're still having trouble post back showing where you're getting stuck.
    Sourman's Avatar
    Sourman Posts: 4, Reputation: 1
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    #3

    Jun 19, 2012, 01:24 PM
    can anyone verify this

    1+tanX/1+cotX = 1-tanX/cot-1
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Jun 19, 2012, 02:07 PM
    Quote Originally Posted by Sourman View Post
    can anyone verify this

    1+tanX/1+cotX = 1-tanX/cot-1
    Please don't double post questions. This question is asked and answered here: https://www.askmehelpdesk.com/math-sciences/trig-identities-help-672820.html
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