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kobeni-chan

  • one year ago

FAN and MEDAL! :) Prove: sin θ - sin θ•cos^2 θ = sin3 θ. You must show all work. I think I use the Pythagorean Identity with this one?

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  1. anonymous
    • one year ago
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    I think you're right :)

  2. anonymous
    • one year ago
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    But in case you need reassurance, try eliminating a common factor and see if the remaining terms look familiar

  3. anonymous
    • one year ago
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    shouldn't it be sin^3 θ not Sin 3θ ??

  4. kobeni-chan
    • one year ago
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    Oh sorry about that. I forgot to fix it so it read as an exponent >_< sin^3 θ

  5. kobeni-chan
    • one year ago
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    Should I divide by sin θ to make it all 1 - cos^2 θ = sin^2 θ? Ohh so it'll be sin^2 θ + cos^2 θ = 1 when i move the cos around.

  6. kobeni-chan
    • one year ago
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    Thanks guys :) Sorry I cant give out more than 1 medal.

  7. anonymous
    • one year ago
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    haha it's alright

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