Video: Cov lus sine cosine thiab tangent los ntawm qhov twg?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Etymology ntawm cosine :"los ntawm co- prefix + sib . Latin cosinus tshwm sim hauv Gunther Canon Triangulorum (1620). lus tangent :"adaptation ntawm Latin tangens, tangent -em, tam sim no koom ntawm tang-ĕre kov; siv los ntawm Th. Fincke, 1583, as noun in sense = Latin līnea tangens tangent los yog kov kab.
Ib yam li ntawd ib tug yuav nug, qhov twg yog kev txhaum thiab cos los ntawm?
Nws yog pab tau kom nco ntsoov tias cov cosine ntawm ib lub kaum sab xis yog tib yam li cov sib ntawm qhov ntxiv ntawm lub kaum sab xis. Hauv lwm lo lus, nws yog tib yam nkaus li sib , tsuas yog hais txog y-axis es tsis txhob x-axis. Lo lus sib Ameslikas los ntawm Latin sinus, lub ntsiab lus "bay" los yog "inlet".
Tsis tas li ntawd, koj yuav nrhiav tau sine cosine thiab tangent li cas? Nyob rau hauv txhua txoj cai angled daim duab peb sab, rau txhua lub kaum sab xis:
- Lub sine ntawm lub kaum sab xis = qhov ntev ntawm qhov opposite sab. qhov ntev ntawm lub hypotenuse.
- Lub cosine ntawm lub kaum sab xis = qhov ntev ntawm sab uas nyob ib sab. qhov ntev ntawm lub hypotenuse.
- Lub tangent ntawm lub kaum sab xis = qhov ntev ntawm qhov opposite sab. qhov ntev ntawm sab uas nyob ib sab.
Ib yam li ntawd ib tug yuav nug, dab tsi yog cos sin tan?
Cov cosine (feem ntau abbreviated " cos ") yog qhov piv ntawm qhov ntev ntawm sab uas nyob ib sab mus rau lub kaum sab xis rau qhov ntev ntawm lub hypotenuse. Thiab lub tangent (feem ntau abbreviated " tan ") yog qhov piv ntawm qhov ntev ntawm sab opposite lub kaum sab xis rau qhov ntev ntawm sab uas nyob ib sab. SOH → kev txhaum = "opposite" / "hypotenuse"
Cov npe ntawm trig functions tuaj qhov twg?
Cov ntsiab lus sine, secant, thiab tangent yog Ameslikas xaiv los ntawm Arab mathematicians vim hais tias ntawm txoj hauj lwm ntawm cov ntu ntawm cov lengths nyob rau hauv lub vajvoog unit.
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