anonymous
  • anonymous
Find cos theta if sin theta =-5/13 and tan theta>0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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freckles
  • freckles
\[\sin^2(x)+\cos^2(x)=1 \\ (\sin(x))^2+(\cos(x))^2=1\]
freckles
  • freckles
replace sin(x) with -5/13
freckles
  • freckles
and solve for cos(x)

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freckles
  • freckles
since tangent is positive and sine is negative then cosine is also negative.
freckles
  • freckles
\[(\frac{-5}{13})^2+(\cos(x))^2=1\] do you know how to solve this equation for cos(x)?
anonymous
  • anonymous
Isolate cos x
freckles
  • freckles
yes that is what we need to do

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