Question

Which expression is equivalent to cos 150°?

Answer 1

$= - 210$

letter D

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Answer 2

We know

$\boxed{\sf cos(180-\Theta)=-cos\Theta}$

Now

$\\ \sf{:}\!\!\implies cos150$

$\\ \sf{:}\!\!\implies cos(180-30)$

$\\ \sf{:}\!\!\implies -cos30$

or

$\\ \sf{:}\!\!\implies cos(-30°)$

Option C