January 2019 1 67 Report
Wyznacz zbiór wartości funkcji:

f (x) = tgx * cosx

Zaczęłam tak :

f (x) = sinx/cosx * cosx = sinx
cosx ≠ 0

cos € <−1,1>

I dalej nie wiem co robić :( O ile to jest dobrze
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