anonymous
  • anonymous
If sin θ = 21/29 , use the Pythagorean Identity to find cos θ.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
\[\cos \theta = \sqrt{1 - \sin \theta ^{2}}\]
anonymous
  • anonymous
i thought i needed to use sin^2+cos^2=1?
anonymous
  • anonymous
oh wait thats the same thing isnt it....

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anonymous
  • anonymous
they are the same
campbell_st
  • campbell_st
just draw a triangle |dw:1436404771140:dw| find x using pythagoras then you can find the cos ratio
anonymous
  • anonymous
i got now thx

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