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College Algebra & Trigonometry, 2018a

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392 CHAPTER 9. GRAPHING THE TRIGONOMETRIC FUNCTIONS<br />

We can label these sides as 1 and 5 and then find the length of the third side in<br />

the triangle. This will allow us to find sin θ and tan θ.<br />

θ<br />

1<br />

360 ◦ −θ<br />

5<br />

√<br />

24<br />

Using the Pythagorean Theorem:<br />

5 2 =1 2 + s 2<br />

25 − 1=s 2<br />

√<br />

24 = s<br />

we find that the side opposite the reference angle for θ is √ 24 or 2 √ 6. We can<br />

now find sin θ and tan θ:<br />

√<br />

sin θ = 24<br />

5<br />

and<br />

tan θ =<br />

√<br />

24<br />

1 = √ 24

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