Puas yog cosine graph ib txwm pib ntawm 1?
Puas yog cosine graph ib txwm pib ntawm 1?

Video: Puas yog cosine graph ib txwm pib ntawm 1?

Video: Puas yog cosine graph ib txwm pib ntawm 1?
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Cosine zoo li Sine, tab sis nws pib ntawm 1 thiab lub taub hau nqes mus txog π radians (180 °) thiab tom qab ntawd rov qab los dua.

Khaws qhov no hauv kev pom, qhov twg cosine pib ntawm daim duab?

Qhov txawv ntawm ob qho no daim duab yog cov pib point rau lub Cosine graph . Nws pib ntawm tus nqi siab tshaj plaws. Sine nkhaus pib ntawm lub hauv paus ntsiab lus.

Tsis tas li ntawd, lub kaum sab xis twg muaj cosine ntawm 1? Sines thiab cosines rau cov ces kaum tshwj xeeb

Qib Radians cosine
60° π/3 1/2
45° π/4 √2 / 2
30° π/6 √3 / 2
0 1

Ntawm no, daim duab ntawm cosine yog dab tsi?

Rau daim duab tus cosine muaj nuj nqi, peb kos lub kaum sab xis raws kab rov tav x axis, thiab rau txhua lub kaum sab xis, peb muab tso rau cosine ntawm lub kaum sab xis ntawm qhov ntsug y-axis. Qhov tshwm sim, raws li pom saum toj no, yog qhov nkhaus nkhaus uas txawv ntawm +1 txog -1. Nws yog tib yam li cov cosine ua haujlwm tab sis hloov mus rau sab laug 90 °.

Tus qauv ntawm cosine yog dab tsi?

Cov cosine muaj nuj nqi, nrog rau sine thiab tangent, yog ib qho ntawm peb feem ntau trigonometric muaj nuj nqi. Nyob rau hauv txhua txoj cai daim duab peb sab, lub cosine ntawm lub kaum sab xis yog qhov ntev ntawm sab uas nyob ib sab (A) faib los ntawm qhov ntev ntawm lub hypotenuse (H). Hauv ib qauv , nws yog sau yooj yim li ' cos '.

Pom zoo: