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sinx=(-5/13) x∈IV ćw.
cosx=√[1-(25/169)] cosx e IV ćw. jest dodatni
cosx=12/13
tgx=-5/12
ctgx=-12/5
2.
założenia:
cos2x≠0 ∧ 1+ctgx≠0∧cosx≠0
2x≠(π/2)+kπ ∧ x≠(-π/4)+kπ ∧ x≠(π/2)+kπ
x≠(π/4)+kπ/2 ∧ x≠(-π/4)+kπ ∧ x≠(π/2)+kπ , k∈C
x≠(π/4)+kπ/2 ∧ x≠(π/20+kπ, k∈C