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    lwilli2's Avatar
    lwilli2 Posts: 2, Reputation: 1
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    #1

    Mar 17, 2008, 03:50 PM
    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
    ISneezeFunny's Avatar
    ISneezeFunny Posts: 4,175, Reputation: 821
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    #2

    Mar 17, 2008, 03:57 PM
    Table of Trigonometric Identities

    Hope that helps at all.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #3

    Mar 17, 2008, 04:03 PM
    Recheck. Neither of those identities is valid.

    #1:











    #2 is not true. Recheck and make sure you typed it correctly.
    lwilli2's Avatar
    lwilli2 Posts: 2, Reputation: 1
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    #4

    Mar 17, 2008, 04:09 PM
    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?
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #5

    Mar 17, 2008, 04:17 PM
    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).
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #6

    Mar 18, 2008, 06:30 AM
    Here is a valid identity.










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