2. Find value of cotpie/20 cot3pie /20 cot5pie/20 cot7pie/20 cot9pie/20

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{^{20} C}_{0} - {^{20} C}_{1} + {^{20} C}_{2} - . . . . . + {^{20} C}_{18} =

20 + \frac{1}{20 + \frac{1}{20....}}

20_{1}^{C} - 2 \times 20_{2}^{C} + 3 \times 20_{3}^{C}

20 \times 20_{2}^{C} 0

^{20} C_{0} +^{20} C_{1} +^{20} C_{2} +^{20} C_{3} +^{20} C_{4} +^{20} C_{12} +^{20} C_{13} +^{20} C_{14} +^{20} C_{15}

^{20} C_{0} -^{20} C_{1} +^{20} C_{2} -^{20} C_{3} + \dots +^{20} C_{10}

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