If you have a stress strain curve that is non-linear the secant modulus is the slope of a straight line connecting the zero strain point to the final strain point of interest
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draw a line vertical from where strain is equal to 2.5%. where it hits your stress vs. strain curve, draw a line from there to the origin the slope of that line is your Es or secant modulus
a secant is a line containing a chord. A secant is a line that intersects the circle twice(or passes through a circle)
Cosine.
Substitute secant(x)=1/cos(x) into your equation, and you should be able to solve from there.
I am almost positive that it isn't because a secant is an extended chord so it goes out of circle. So no it is not.