Question 1061596
{{{ y = 4*cos( (1/2)*x ) }}}
The cosine function repeats every {{{ 2*pi }}} radians
Check {{{ (1/2)*x }}} over {{{ 0 }}} radians to {{{ 2*pi }}} radians
{{{ (1/2)*x = 0 }}}
{{{ x = 0 }}}
and
{{{ (1/2)*x = 2*pi }}}
{{{ x = 4*pi }}}
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Answer is (D)
This function of {{{ x }}} repeats
every {{{ 4*pi }}} radians