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anonymous

  • one year ago

If sin θ = 21/29 , use the Pythagorean Identity to find cos θ.

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  1. anonymous
    • one year ago
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    \[\cos \theta = \sqrt{1 - \sin \theta ^{2}}\]

  2. anonymous
    • one year ago
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    i thought i needed to use sin^2+cos^2=1?

  3. anonymous
    • one year ago
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    oh wait thats the same thing isnt it....

  4. anonymous
    • one year ago
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    they are the same

  5. campbell_st
    • one year ago
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    just draw a triangle |dw:1436404771140:dw| find x using pythagoras then you can find the cos ratio

  6. anonymous
    • one year ago
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    i got now thx

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