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  • ...^{2008}\right)^2-\left(3^{2006}\right)^2}{\left(3^{2007}\right)^2-\left(3^{2005}\right)^2}</cmath> ...e <math>PQRS</math> lies in a plane with <math>PQ=RS=2</math> and <math>QR=SP=6</math>. The rectangle is rotated <math>90^\circ</math> clockwise about <m
    14 KB (2,138 words) - 15:08, 18 February 2023
  • * Language (RU, EN, DE, FR, SP, IT, CH) ** Archive from 2005 to 2017
    16 KB (1,987 words) - 11:39, 17 February 2024