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Answer 1 · 2017-12-05T07:17:46

$x=9,21,-3,33,-15,45,-27,.....$

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$y=sin((pix)/6)+1$

$sin((pix)/6)+1=0$

$sin((pix)/6)=-1=sin((3pi)/2)=sin((3pi)/2+-2npi)$

$(pix)/6=(3pi)/2+-2npi$

$(cancelcolor(red)pix)/6=(3cancelcolor(red)pi)/2+-2ncancelcolor(red)pi$

$x/6=3/2+-2n$

$x=9+-12n$

where $n=0,1,2,3,4,................$