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=całka tdt / √(1 - t²) = 1/2*całka 2tdt / √(a - t⁴) = {u = t², du = 2tdt}
=1/2*całka du / √(1 - u²) = 1/2*arcsinu = 1/2*arcsint² =
= 1/2*arcsin(arctg²x) + C