Find cos(θ) if sin(θ) is given and θ terminates in QIII.

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Find cos(θ) if sin(θ) is given and θ terminates in QIII.

Mathematics
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sin (theta) = -((sqrt15)/8)
Are you allowed to use the arcsine function? You could take the arcsine and find the theta and then simply do cos (theta).
I figured it out!! Thanks anyway, man (or woman)! Haha!

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I realized that 8 would be the bottom number, so I used the Pythagorean Theorem. :)

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