Koj puas tuaj yeem siv kev txhaum thiab cos ntawm cov duab peb sab tsis zoo?
Koj puas tuaj yeem siv kev txhaum thiab cos ntawm cov duab peb sab tsis zoo?

Video: Koj puas tuaj yeem siv kev txhaum thiab cos ntawm cov duab peb sab tsis zoo?

Video: Koj puas tuaj yeem siv kev txhaum thiab cos ntawm cov duab peb sab tsis zoo?
Video: Tshuaj theem vim li cas thiaj tau nqi ?/ Siv kho mob dab tsi?/paris polyphylla use for? 2024, Kaum ib hlis
Anonim

Xav txog lwm tus tsis yog - txoj cai daim duab peb sab , sau npe raws li qhia nrog sab ntev x thiab y. Peb ua tau muab ib txoj cai muaj txiaj ntsig uas tsuas muaj cov cosine muaj nuj nqi. Txoj cai ntawm cosines ua tau siv los nrhiav qhov ntsuas ntawm lub kaum sab xis lossis ib sab ntawm a tsis yog - txoj cai daim duab peb sab yog peb paub: peb sab thiab tsis muaj kaum sab xis.

Tom qab ntawd, ib tus tuaj yeem nug, sine puas tuaj yeem siv rau ntawm daim duab peb sab tsis yog?

Txoj Cai ntawm Sines tau ua siv daws oblique daim duab peb sab ,qu yog tsis yog - txoj cai daim duab peb sab . Raws li Txoj Cai ntawm Sines , qhov piv ntawm qhov ntsuas ntawm ib qho ntawm cov ces kaum mus rau qhov ntev ntawm nws qhov opposite sab sib npaug rau lwm qhov sib piv ntawm lub kaum sab xis ntsuas rau sab nraud. Muaj peb kis tau: ASA, AAS, SSA.

Qhov thib ob, koj tuaj yeem ua Sohcahtoa ntawm cov duab peb sab tsis yog? Yuav ua li cas trigonometry siv rau tsis yog - txoj cai angled daim duab peb sab ? Rau ua qhov no, muaj yog Ob txoj cai, Txoj Cai Sine thiab Txoj Cai Cosine. Txoj cai sine yog a / Sin A = b / Sin B = c / Sin C. Txoj cai sine yog siv thaum koj txawm muaj vlaue ntawm ob lub ces kaum thiab ib sab, los yog ob sab thiab ib lub kaum sab nraud ib ntawm cov sab ntawm a daim duab peb sab.

Dhau li ntawm qhov no, puas yog qhov sib piv cosine ua haujlwm nrog cov duab peb sab tsis zoo?

Trigonometric functions yog txhais rau a txoj cai daim duab peb sab , tab sis qhov ntawd tsis txhais hais tias lawv tsuas yog ua haujlwm rau txoj cai daim duab peb sab ! Piv txwv li, muaj cov cai uas ua haujlwm rau tsis yog - txoj cai daim duab peb sab . Cov no yog hu ua txoj cai ntawm kev txhaum thiab txoj cai ntawm cosines . C^2 = A^2 + B^2 vim cosine ntawm 90 degree yog 0.

Dab tsi yog txoj cai sine rau Daim duab peb sab?

Cov Sine Txoj Cai Txoj Cai ntawm Sines ( txoj cai sine ) yog ib qho tseem ceeb txoj cai hais txog ob sab thiab cov ces kaum ntawm ib qho twg daim duab peb sab (nws tsis tas yuav yog lub kaum sab xis!): Yog tias a, b thiab c yog qhov ntev ntawm ob sab ntawm cov ces kaum A, B thiab C hauv ib qho daim duab peb sab , then: a = b = c. sinA sinB sinC.

Pom zoo: