Question 1091112
Since {{{ theta }}} isn't specified, the choce
must hold true for any {{{ theta }}}, so I'll
say {{{ theta = 0 }}} radians
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A) 
{{{ cos(0) = sin( 0 + pi ) }}}
{{{ 1 = 0 }}} NOT TRUE
B)
{{{ cos(0) = sin (0 - pi ) }}}
{{{ 1 = 0 }}} NOT TRUE
C)
{{{ cos(0) = sin( 0 + pi/2 ) }}}
{{{ 1 = 1 }}} TRUE
D)
{{{ cos(0) = sin( 0 - pi/2 ) }}}
{{{ 1 = -1 }}} NOT TRUE
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The answer is C)