Determine all in at which the graph of has an inflection point

MATHEMATICS · Subjective · A Level · Mathematics · Differentiation · Differentiation

Problem

Determine all xx in (−π/2, π/2)(-\pi/2,\,\pi/2) at which the graph of y=sec⁡xy=\sec x has an inflection point, or state that none exist, and justify your conclusion using the sign of the second derivative.

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