Question 316899
{{{tan(theta)=-sqrt(3)/3=-1/sqrt(3)=-(1/2)/(sqrt(3)/2))}}}
Find the angle whose sin={{{-1/2}}}, cos={{{sqrt(3)/2}}} or sin={{{1/2}}}, cos={{{-sqrt(3)/2}}}.
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{{{theta=150}}} and {{{theta=330}}}