Question 859944
The adjacent side is {{{ 1 }}}
The rotating vector is {{{ 2 }}}
The opposite side is {{{ sqrt(3) }}},
so {{{ theta = 60 }}} degrees
and {{{ theta = pi/3 }}}
This is with {{{ theta }}} in the 1st quadrant
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{{{ theta }}} could also be in the 4th quadrant
The adjacent side is {{{ 1 }}}
The rotating vector is {{{ 2 }}}
The opposite side is {{{ -sqrt(3) }}},
{{{ theta = 300 }}} degrees
and {{{ theta = ( 5*pi ) / 3 }}}
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In the the other 2 quadrants, 2nd and 3rd, 
the cos is negative