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Find cos(−30°) and sin(−30°). Identify the measure of the reference angle.

User Printemp
by
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1 Answer

5 votes

Answer:

Reference angle will be
60^(\circ)


cos(-30)=0.866


sin(-30)=-0.5

Explanation:

We have given angle =
-30^(\circ) which is equivalent to
300^(\circ)

We know that 300° lies in forth quadrant

For forth quadrant reference angle is given by
300^(\circ)-angle

So reference angle
=360^(\circ)-300^(\circ)=30^(\circ)

Now
cos(-30)=cos(30)=0.866

And
sin(-30)=-sin(30)=-0.5

User Mario Velasco
by
9.1k points
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