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sabika13

  • 3 years ago

how do prove this identity: sin^4x -cos^4x=1-2cos^2x

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  1. sabika13
    • 3 years ago
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    RS: (sin^2x+cos^2x)-2cos^2x sin^2x-cos^2x Thats how much i can simplify right side..

  2. jennyjewell25
    • 3 years ago
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    @sabika13 your posting in the wrong subject, post in math you will get tons more help

  3. sabika13
    • 3 years ago
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    oh shoot, didnt realize that..thanks

  4. jennyjewell25
    • 3 years ago
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    @sabika13 its ok lol goodluck

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