
Value of sec^2 x
Hi,
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.
Thanks.

What kind of calculator do you have? Is it set in radians or degrees? What exact button combination are you using?

Set your calculator to radian mode. Especially when you are working in Calculus, where the derivative of the (sin(x))'= cos(x) is only true when x is in radians.