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Can someone please help me

Can someone please help me-example-1
User Avision
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1 Answer

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Answer: tan -390 = (-√3)/3

Explanation:

In order to find your reference angle add 360 to the angle they give you.

-390 + 360 = -30

Your reference angle is 30°. Using a unit circle:

Where sin 30 = 1/2 and cos x = √3/2

Since we are looking at -30, in quadrant 4, you y/sin is -

sin -30 = -1/2 and cos -30 = √3/2

tan -30 = (sin -30)/(cos -30) >substitute

tan -30 = (-1/2)/(√3/2) >Keep change flip fractions

tan - 30 = (-1/2)*(2/√3) >simplifly

tan -30 = -1/√3 >get rid of root on bottom

tan - 30 = (-√3)/3

tan -390 = (-√3)/3

User Mahani
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