Find cos theta if sin theta =-5/13 and tan theta>0

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Find cos theta if sin theta =-5/13 and tan theta>0

Mathematics
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\[\sin^2(x)+\cos^2(x)=1 \\ (\sin(x))^2+(\cos(x))^2=1\]
replace sin(x) with -5/13
and solve for cos(x)

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Other answers:

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

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