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In Exercises 21–24, θ is an acute angle and sin θ is given. Use the Pythagorean identity sin²θ + cos²θ = 1 to find cos θ.sin θ = 6/7
3. Unit Circle
Trigonometric Functions on the Unit Circle
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Write each function in terms of its cofunction. Assume all angles involved are acute angles. See Example 2.tan 25.4°
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