Answer:
Reference angle will be [tex]60^{\circ}[/tex]
[tex]cos(-30)=0.866[/tex]
[tex]sin(-30)=-0.5[/tex]
Step-by-step explanation:
We have given angle = [tex]-30^{\circ}[/tex] which is equivalent to [tex]300^{\circ}[/tex]
We know that 300° lies in forth quadrant
For forth quadrant reference angle is given by [tex]300^{\circ}-angle[/tex]
So reference angle [tex]=360^{\circ}-300^{\circ}=30^{\circ}[/tex]
Now [tex]cos(-30)=cos(30)=0.866[/tex]
And [tex]sin(-30)=-sin(30)=-0.5[/tex]
