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Back to Prove and use Pythagorean identity — Problem 1 · Task Set 78

Exercises: Pythagorean Identity: Proof and Applications

Grade 9·21 problems·~35 min·Common Core Math - HS Functions·group·hsf-tf-c-8
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A

Fluency Practice

1

Given cos⁡θ=45\cos\theta = \dfrac{4}{5} and θ\theta is in Quadrant I, use
the Pythagorean identity to find sin⁡θ\sin\theta. Express your answer as
a fraction in simplest form.