- Series k=0 to infinity (-1)^k ((pi/4)^2k)/(2k)! find the sum. can any solve this?

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http://www.newsweek.com/how-will-world-end-another-doomsday-looms-here-what-could-actually-bring-714437? Is the Universe chicken egg shaped? In a triangle ABC , a = 90 degree and D is the midpoint of AC . The value of BC square - ND square is equal to ?