Formule matematice
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Formule trigonometrice sin α = a c =a/ c . a, b – catete cos α = b c =b/ c . c - ipotenuză tan α = a b =a/ b . cot α = b a =b/ a . tan α = sin α cos α =sinα / cosα . cot α = cos α sin α =cosα / sinα . tan α cot α=1=tgα∗ctgα . sin ( π 2 ±α ) =cos α=sin ( π / 2 ±α ). cos ( π 2 ±α ) =∓ sin α= cos ( π / 2 ±α) . tan ( π 2 ±α ) =∓ cot α= tg( π / 2 ±α) . cot ( π 2 ±α ) =∓ tan α= ctg( π / 2 ±α ). sin 2 α +cos 2 α=1=sinα∗sinα +cosα∗cosα . sin ( α±β ) =sin α cos β± cos α sin β .
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Transcript of Formule matematice
Formule trigonometrice
sinα=ac=a/c. a, b – catete
cos α=bc=b/c. c - ipotenuză
tanα=ab=a/b.
cotα=ba=b/a.
tanα= sin αcos α
=sinα /cosα.
cotα= cos αsinα
=cosα / sinα.
tanα cotα=1=tgα∗ctgα.
sin( π2 ±α)=cos α=sin (π /2±α ).
cos ( π2 ±α)=∓sin α=cos (π /2±α ).
tan( π2 ±α)=∓cot α=tg(π /2±α).
cot ( π2 ±α )=∓ tanα=ctg(π /2±α ).
sin2α+cos2α=1=sinα∗sinα+cosα∗cosα.
sin (α ± β )=sin α cos β ±cos α sin β.
cos (α ± β )=cosα cos β± sin βcos α.
tan (α ± β )= tanα ± tan β1∓ tanα tan β
=(tgα ± tgβ )/(1∓ tgα∗tgβ ).
cot (α ±β )= cotα cot β∓1cot β± cot α
=(ctgα∗ctgβ∓1)/(ctgβ ±ctgα).
NUME NR. ABSENȚE MOTIVATEAndreescu Marilena 0 0Andrei Loredana 3 2Baros Diana 4 2Blidaru Alexandru 10 10Borțosu Cristina 2 1Constantin Cătălina 3 2Crăciun Olimpia 4 2Duman Nicoleta 1 1Filipescu Alina 2 2Gălbeoru Georgiana 0 0Groșaru Roxana 2 2Ilie Mirela 2 2Ion Mihnea 5 4Lixandru Albert 5 3Lungu Alexandra 6 3Marinescu Mihai 1 1Matei Diana 4 2Mucenic Bianca 3 2Neacșu Alexandra 8 8Pîrvu Ioana 4 2Popescu Andreea 2 2Spiridon Ioana 0 0Stoicescu Cristian 10 8Tatu Diana 2 1Tănase Iuliana 5 4Trandafir Mădălina 2 2Țimonea Victoria 1 1Vaporu Livia 2 1Zăvoianu Alexandra 4 2TOTAL 97 72
