Cov txheej txheem:
Video: Yuav ua li cas koj daws Tan tus kheej?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Txhawm rau txiav txim siab qhov txawv ntawm tus kheej rau tangent, siv qhov tseeb tias tan(−β) = −tanβ
- Piv txwv 1: Nrhiav tus nqi tiag tiag ntawm tan 75°.
- Piv txwv 2: Tshawb xyuas qhov ntawd tan (180° − x) = − tan x.
- Piv txwv 3: Tshawb xyuas qhov ntawd tan (180° + x) = tan x.
- Piv txwv 4: Tshawb xyuas qhov ntawd tan (360° − x) = − tan x.
- Piv txwv 5: Txheeb xyuas qhov tus kheej .
Tsis tas li ntawd, tus qauv rau tangent yog dab tsi?
Nyob rau hauv txhua txoj cai daim duab peb sab, lub tangent ntawm lub kaum sab xis yog qhov ntev ntawm sab nraud (O) muab faib los ntawm qhov ntev ntawm sab uas nyob ib sab (A). Hauv ib qauv , nws yog sau yooj yim li 'tan'. Feem ntau nco ntsoov ua "SOH" - lub ntsiab lus Sine yog Opposite tshaj Hypotenuse.
Tsis tas li ntawd, koj yuav rov sau ib daim ntawv tangent li cas? Txhawm rau rov sau cov haujlwm sine hauv cov ntsiab lus ntawm tangent, ua raws cov kauj ruam no:
- Pib nrog qhov piv txwv tus kheej uas muaj sine, cosine, thiab tangent, thiab muab txhua sab los ntawm cosine kom tau sine ib leeg ntawm sab laug.
- Hloov cosine nrog nws txoj haujlwm sib luag.
- daws Pythagorean tus kheej tan2θ + 1 = sec2θ rau secant.
Nyob rau hauv no hais txog, dab tsi yog lub kaum sab xis qauv?
Hais txog Kev Sau Ntawv. Cov cosine ob lub kaum ntse ntse formula qhia peb tias cos(2θ) yeej ib txwm sib npaug rau cos²θ-sin²θ. Piv txwv li, cos(60) yog sib npaug rau cos²(30)-sin²(30). Peb tuaj yeem siv tus kheej no los sau cov lus rov los yog daws teeb meem.
Lub tangent yog dab tsi?
Qhov sum tus kheej rau tangent yog muab tau raws li nram no: los txiav txim qhov txawv tus kheej rau tangent , siv qhov tseeb tias tan (−β) = -taub. Lub kaum sab xis tus kheej rau tangent yog tau los ntawm kev siv tus lej tus kheej rau tangent . Lub kaum sab xis tus kheej rau tangent tuaj yeem sau ua peb hom ntawv sib txawv.
Pom zoo:
Yuav ua li cas koj thiaj paub yog tias tus nqi sib npaug tsis muaj kev daws teeb meem?
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