Question 1035229
Rotate the unit vector in the CW direction
from the zero reference ( due to the minus sign )
{{{ pi/4 }}} is visualized as 45 degrees, so
{{{ 45*7 = 315 }}} degrees
That is 45 degrees short of returning to the
zero reference ( turning CW ).
So, the reference angle would be {{{ pi/4 }}} 
in the 1st quadrant