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Back to Prove and use Pythagorean identity — Problem 2 · Task Set 77

HSF.TF.C.8 Tutor Intake — Pythagorean Identity and Trig Values

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Grade 9·10 problems·~13 min·Common Core Math - HS Functions·group·hsf-tf-c-8
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Procedures

1.

Given sin⁡(θ)=−513\sin(\theta) = -\dfrac{5}{13} and θ\theta is in Quadrant III, use the
Pythagorean identity to find cos⁡(θ)\cos(\theta). Enter your answer as a fraction
(e.g., -12/13).