Question 388510
{{{cos(theta)=1/4}}}
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{{{sin(theta)=sqrt(1-1/16)}}}
{{{sin(theta)=0 +- sqrt(15)/4}}}
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{{{tan(theta)=sin(theta)/cos(theta)=(0 +- sqrt(15)/4)/(1/4)}}}
{{{highlight(tan(theta)=0 +- sqrt(15))}}}