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o ² = 81 - 9
o ² = 72
o = 6 √ 2
T²=√15²-2√11²
T² = 15 - 2 * 11
T² = 15 - 22
T² = - 7
T = √- 7
0^2=81-9
o^2=72 / √
o= 6 √ 2 (bo 36*2= 72, wiec wyciagamy √ z 36 i zostaje √ z 2)
T^2= 15-22
T^2= -7 / √
T= - √ 7