August 2018 1 52 Report
Wiedząc, że tg a + ctg a = 4, oblicz:

a) | tg a - ctg a |
b) tg^{2} a + ctg^{2} a
c) tg^{3} a + ctg^{3} a
d) tg^{4} a + ctg^{4} a

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