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				| 1. | What is the formula for chebyshev polynomial TN(x) in recursive form? | 
| A. | 2T<sub>N-1</sub>(x)- T<sub>N-2</sub>(x) | 
| B. | 2T<sub>N-1</sub>(x)+ T<sub>N-2</sub>(x) | 
| C. | 2xT<sub>N-1</sub>(x)+ T<sub>N-2</sub>(x) | 
| D. | 2xT<sub>N-1</sub>(x)- T<sub>N-2</sub>(x) | 
| Answer» E. | |