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**Unformatted text preview: **a, b, and c. 3. State an equation that can be used to solve for x . 7 13 x 7 2 + x 2 = 13 2 4. In ± DEF ∠ D =90 o , ∠ E = 64 o , and side e = 9. Find the length of side d. 9sin64 o 09 . 8 ≈ 5. Sketch ± ABC with ∠ C = 90 o . What is the relationship between cos A and sin B ? cos A and sin B are equal. A B C c a sin B = a b cos B = a c tan B = c b b...

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