Question 337104
There are a handful of values you should know and commit to memory.
They are available on any calculator, EXCEL, and even at GOOGLE.
They are essential to trigonometry.
{{{cos(theta)=sin(theta)=0}}}
{{{cos(theta)=sin(theta)=sqrt(2)/2}}}
{{{cos(theta)=sin(theta)=1/2}}}
{{{cos(theta)=sin(theta)=sqrt(3)/2}}}
{{{cos(theta)=sin(theta)=1}}}
{{{cos(theta)=sin(theta)=-sqrt(2)/2}}}
{{{cos(theta)=sin(theta)=-1/2}}}
{{{cos(theta)=sin(theta)=-sqrt(3)/2}}}
{{{cos(theta)=sin(theta)=-1}}}
.
.
.
{{{cot(theta)=2}}}
{{{tan(theta)=1/2}}}
Use a calculator, tangent table, EXCEL or GOOGLE.