November 2018 1 10 Report
A)
1 + ctgalfa = sin alfa + cos alfa / sin alfa
b)
1 + tg^2 alfa= 1/ cos^2 alfa
c)
(tg alfa + 1)(ctg alfa - 1)= ctg alfa - tg alfa

Prosze o wytłumaczenie i napisanie co i jak i dlaczego :D
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