Question 894379
I'll say {{{ alpha = 2*theta }}}
{{{ sin ( alpha ) = 1/sqrt(2) }}}
{{{ alpha = pi/4 }}}
also
{{{ alpha = (3*pi)/4 }}}
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sin functions in the 3rd and 4th quadrants are 
negative, so I can't include these
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Now I can say:
{{{ 2*theta = alpha }}}
{{{ theta = alpha/2 }}}
{{{ theta = ( pi/4 ) / 2 }}}
{{{ theta = pi/8 }}}
and
{{{ theta = (( 3*pi )/4 ) / 2 }}}
{{{ theta  = ( 3*pi )/8 }}}