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In Exercises 143-150, use a half-angle formula to evaluate each expression without using a calculator. Note to instructors: The final answer to these exercises is

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In Exercises 143-150, use a half-angle formula to evaluate each expression without using a calculator. Note to instructors: The final answer to these exercises is completely simplified. 3 TT 145. tan 157.50 143. sin 144. cos (-22.50 ) 146. sin 67.50 8 13 TT TT 5 TT 9 TT 149. csc 150. sec 147. cos 148. tan 8 12 12 12

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