Seudónimo Seudónimo

21-09-2021
Mathematics

contestada

Which expression is equivalent to cos 150°?
three choices are:
A. cos 30°
B. cos 330°
C. cos (-30°)
D. cos (-210°)

Respuesta :

Аноним Аноним

21-09-2021

We know

[tex]\boxed{\sf cos(180-\Theta)=-cos\Theta}[/tex]

Now

[tex]\\ \sf{:}\!\!\implies cos150[/tex]

[tex]\\ \sf{:}\!\!\implies cos(180-30)[/tex]

[tex]\\ \sf{:}\!\!\implies -cos30[/tex]

or

[tex]\\ \sf{:}\!\!\implies cos(-30°)[/tex]

Option C

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