principal value of sec
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range is R-(-1,1)
domain is R- (2n+1)π/2
principal value of sec lies between 0 ≤theta≥ π and theta ≠ π/2
domain is R- (2n+1)π/2
principal value of sec lies between 0 ≤theta≥ π and theta ≠ π/2
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