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

    Feb 14, 2013, 08:49 PM
    Verifying identities
    1)cos^2-sin^2 x=1-2 sin^2x

    2)1/1-coax+1/1+cos x=2csc^2x

    3)(cot ^2x+1)(sin^2x-1)=-cot^2x
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Feb 15, 2013, 07:39 AM
    I gave you same hints on how to approach identities like these here:

    https://www.askmehelpdesk.com/mathem...ml#post3397050

    Please show us your attempt at solving these and we'll help if you get stuck.
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