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    Ukraine500's Avatar
    Ukraine500 Posts: 4, Reputation: 1
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    #1

    Nov 7, 2012, 07:41 PM
    verify the trig. Identities
    Hello, I need help on verifying the two Trig. Identities below.

    1. (1+sinx)/(1-sinx)=(secx+tanx)^2

    2.(1-2cos^2x)/(sinxcosx)=tanx-cotx


    Any help will be greatly appreciated. Thanks!
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Nov 8, 2012, 08:51 AM
    Hint for 1: multiply the left hand side by (1+sinx)/(1+sinx) and see what you get.

    For 2: the numeratyor on the left side equals -cos(2x), and there are two other form of the identity for cos(2x) that you can swap it out for - one of those other forms is what you want to use.
    Ukraine500's Avatar
    Ukraine500 Posts: 4, Reputation: 1
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    #3

    Nov 8, 2012, 01:22 PM
    Can you show me step-by-step on how to verify the two problems? I get extremely frustrated when doing these types of problems.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Nov 9, 2012, 06:54 AM
    If you try the hint I gave you where does it take you? Please show us what you've tried, and where you're getting stuck, then we can help you past that point.
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