Question 988011
{{{y = -2 + 3 sin (x + Pi/2) }}}
Here's the plot:
{{{ graph( 600, 400, -14, 14, -6, 2, -2 + 3*sin( x + pi/2 )) }}} 
Note that everywhere {{{ y = 0 }}}, {{{ sin( x + pi/2 ) = 2/3 }}}
Note that when {{{ x = 0 +- 2*pi }}} , {{{ y = 1 }}}