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-   -   Need to verifying Trig identities (https://www.askmehelpdesk.com/showthread.php?t=195653)

  • Mar 17, 2008, 03:50 PM
    lwilli2
    Need to verifying Trig identities
    I'm stuck!

    Can someone please help?

    I need to verify?

    tanx + cotx = 2tanx - cscx secx

    and

    (csc(squared)x ) (cos(squared)x) - cos(squared)x = -1





    Any help is greatly appreciated Thanks
  • Mar 17, 2008, 03:57 PM
    ISneezeFunny
    Table of Trigonometric Identities

    Hope that helps at all.
  • Mar 17, 2008, 04:03 PM
    galactus
    Recheck. Neither of those identities is valid.

    #1:











    #2 is not true. Recheck and make sure you typed it correctly.
  • Mar 17, 2008, 04:09 PM
    lwilli2
    Quote:

    Originally Posted by lwilli2
    I'm stuck!

    Can someone please help?

    I need to verify?

    tanx + cotx = 2tanx - cscx secx

    and

    (csc(squared)x ) (cos(squared)x) - cos(squared)x = -1





    Any help is greatly appreciated Thanks

    Thanks galactus

    I did double check #2. I do not think it is an identity.

    They way you worked out #1. My teacher said that we should pick one side and try to manipulate it so it it equals the other side.

    so your

    secX cscX does not = 2tanX - cscX secX

    or am I missing something?
  • Mar 17, 2008, 04:17 PM
    galactus
    If the identity were valid, you could plug in something and get the same answer from both

    sides. It would appear the 2tan(x) is extraneous. It works out to be just

    csc(x)sec(x).
  • Mar 18, 2008, 06:30 AM
    galactus
    Here is a valid identity.










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