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Math Help - Trig Proof

  1. #1
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    Trig Proof

    Im caught up on this proof... need some help

    CosX/SecX+SinX/CscX=Sec^2X-Tan^2X
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Brndo4u View Post
    Im caught up on this proof... need some help

    CosX/SecX+SinX/CscX=Sec^2X-Tan^2X
    Note that the left hand side is \cos^2 x + \sin^2 x = 1

    Now recall that 1 + \tan^2 x = \sec^2 x

    What can you conclude?
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  3. #3
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    Quote Originally Posted by Brndo4u View Post
    Im caught up on this proof... need some help

    CosX/SecX+SinX/CscX=Sec^2X-Tan^2X
    Think of secx as \frac{1}{cosx} and cosecx as \frac{1}{sinx}. when you've got something like

    \frac{cosx}{1/cosx} then do you think that this could equate to cos^2 x? Does this help you for the rest of the question if you can recall other identities that you need?
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  4. #4
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    Yes, that I see what you guys are saying... I need to use the Recip ID, Which in the end will give me Sin^2 & Cos^2. That will become 1 and Sec^2 & Tan^2 will also be 1...So, 1 =1
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