Yuav ua li cas koj xam tus nqi ntawm kev txhaum 18?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2024-01-18 08:15

Tus nqi ntawm kev txhaum 18°

1. Yuav ua li cas nrhiav meej tus nqi ntawm kev txhaum 18 °?
2. Cia A = 18 °
3. Yog li, 5A = 90 °
4. ⇒ 2A + 3A = 90˚
5. ⇒ 2θ = 90˚ - 3A.
6. noj sib ntawm ob sab, peb tau txais.
7. kev txhaum 2A = kev txhaum (90˚ - 3A) = cos 3A.
8. ⇒ 2 kev txhaum A cos A = 4 cos^3 A - 3 cos A.

Nyob rau hauv no hais txog, yuav ua li cas koj nrhiav tau lub sine ntawm lub kaum sab xis?

Cov sib muaj nuj nqi, nrog rau cosine thiab tangent, yog ib qho ntawm peb feem ntau trigonometric functions. Nyob rau hauv daim duab peb sab, lub sine ntawm ib lub kaum sab xis x yog qhov ntev ntawm sab nraud (O) faib los ntawm qhov ntev ntawm lub hypotenuse (H). Hauv ib qauv , nws yog sau li ' kev txhaum 'tsis muaj':

kev txhaum sib npaug li cas? Koj yuav tsum muab lawv rau kev nco. Ib txwm, ib txwm, lub sib ntawm lub kaum sab xis yog sib npaug sab nraud muab faib los ntawm hypotenuse (opp / hyp hauv daim duab). Cov cosine yog sib npaug sab uas nyob ib sab faib los ntawm lub hypotenuse (adj/hyp). (1) Nco: sib = (oppositeside) / hypotenuse. cosine = (sab ib sab) / hypotenuse.

Hauv qhov no, Secant hypotenuse puas nyob ib sab?

Ib yam li ntawd, lub ntsiab lus ntawm cosine yog sawv cev los ntawm cah (cosine sib npaug nyob ib sab ntawm hypotenuse ), thiab lub ntsiab txhais ntawm tangent yog sawv cev los ntawm toa (tangent sib npaug sib npaug nyob sib ze ). Ntawd yog, cosecant yog qhov sib txuam ntawm sine, secant yog qhov sib txuam ntawm cosine, thiab cotangent yog thereciprocal ntawm tangent.

Sinh yog dab tsi?

Sinh yog lub hyperbolic sine muaj nuj nqi, uas yog lub hyperbolic analogue ntawm Sin ncig muaj nuj nqi siv thoob plaws trigonometry. Nws yog txhais rau cov zauv tiag tiag los ntawm lettingbe ob zaug ntawm thaj tsam ntawm lub axis thiab ib txoj kab hluav taws xob los ntawm lub hauv paus los cuam tshuam cov chav tsev hyperbola.