If sec theta = - root 2 , and 3pi/2

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let theta be x

sec x= -root2

if sec x= +root2, then x= pi/4

sec x= -root2 lies in the 2nd quadrant. hence, sec x= pi-pi/4 =3pi/4

P.s.=3pi/4, pi+pi/4= 5pi/4

G.s.= 2n pi+or-y = 2npi+or-3pi/4 where n belongs to Z

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