functii cos sin
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Functia sinus 1. Sinusul lui αnotat sin α este ordonata punctului M α . 2.Functia sinus este functia definita pe R cu valori in R prin care α apartine lui R I se asociaza un numar y α notat sinα. PROPRIETATI : 1. –1<=si nα<=1 2.Formula fundamentala a trigonometriei : sin 2 α+cos 2 α=1 => α α 2 c o s 1 s in − ± = 3.Functia sinus este o functie periodica de perioada 2kπ unde k apartine lui Z sin (α+2kπ) =sinx 4.Functia sinus este o functie impara adica sin(-x)= -sin(x) 5. Semnul functiei sinus Caranul I II III IV Functia sinus + + - - 6. Monotonia functiei sinus Cadranul I II III IV Functia sinus 7. Graficul functiei sinus (sinusoid)
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