Video: Kev txhaum 2x sib npaug li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
sib 2x =( kev txhaum x)2=12(1−cos( 2x ib )).
Cia li xav txog qhov no, kev txhaum 2x txhais li cas?
Kev txhaum x^2 yog cov "sine of (x-squared)", yog li nws yog ib qho kev ua haujlwm zoo tib yam. Kev txhaum ^ 2 x ib yog "sine-squared ntawm x" uas yog qhov sib txawv ntawm cov haujlwm sine. Kev txhaum x^2 txhais tau tias square ntawm lub kaum sab xis thiab lub sine ntawm nws.. i.e. kev txhaum 30^2 = kev txhaum 900. Kev txhaum ^ 2 x ib = square of the sine of angle x.
Tsis tas li ntawd, ob lub kaum sab xis yog dab tsi rau kev txhaum 2x? Kev txhaum x yuav tsis muab tus nqi rau kev txhaum 2x. Tsis yog yuav noj ib nrab ntawm kev txhaum x, muab kev txhaum rau koj (x/2). Peb tuaj yeem tsim ob lub kaum sab xis qauv ncaj qha los ntawm kev siv cov qauv sib ntxiv rau sib , cosine thiab tangent . Ib yam li ntawd, koj tuaj yeem nrhiav tau cos 2 x ug tan 2x ib.
Ib yam li ntawd, kev txhaum 2x zoo ib yam li sin2x?
Yog nws yog. kev txhaum ^ 2x ib yog cov ib yam as sinx^2 vim hais tias nyob rau hauv ob qho tib si lub "^2" yog hais txog x.
Cos 2x txhais li cas?
Cos ( 2x ib ) tsuas yog "ob lub kaum sab xis" trig ua haujlwm tsis muaj dab tsi rau " ua " ntawm lub laij lej, tshwj tsis yog peb tau sim ntsuas qhov cosine rau ib co nqi ntawm 2x ib qhov twg x yog kaum thiab 2x ib yog ob zaug qhov ntsuas ntawm lub kaum sab xis. CPhill Lub Tsib Hlis 31, 2015. +5. Melody Lub Tsib Hlis 31, 2015.
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