Monday, February 28, 2011

What are these math expressions

(1)
What's

0 + 1 - (2 * 3 / 4) + 5 - (6 * 7 / 8) + 9 - (10 * 11 / 12) + ... - (18 * 19 / 20)?


Is there a pattern if you continue it out?


(2)

What is

cos(Pi/3) * cos(Pi/4) * cos(Pi/5) * cos(Pi/6)* cos(Pi/7) *....?
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