sec(x)=1/cos(x), by definition of secant.
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cos x - 1 = 0 cos(x) = 1 x = 0 +/- k*pi radians where k = 1,2,3,...
It would be 1 over square root 5.
Secant x= 1/cosx So if cos x=1 ,we know that x=0 degrees ( or radians), so secant x is 1/cos (0)=1/1=1
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y = cos ( x ). z = cos ( x + 180 degrees ).