What kind of calculator do you have? Is it set in radians or degrees? What exact button combination are you using?
Could some work out the value of sec^2 x when x is 0.25. I understand that sec^2 x is 1/cos^2 x. I keep getting 1.000019039 but I know this is not correct.
Could someone see whether they get the same values.
Also when x is equal to : 0.5, 0.75, and 1.
I am revising the Simpson's rule.