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Question 1 (5 points) Match each expression with its equivalent expression. 1. sin(160) sin(140 ) cos(20) - cos(140) sin (20) 2. sin(120) 3. cos(160) cos(140) cos(20 ) - sin(140 ) sin(20 ) 4. cos (120) tan(140) +tan(20) 1-tan(140) tan(20) 5. tan(160) 6. tan(120)