Question

(2sec^2pi)-(4sin^2(pi/2))+/5cospi/

is it equal to 3?

Answer 1

you need to know that sinpi/2=1 and cospi=-1
So
2sec^2pi=2
4sin^2(pi/2)=4
5cospi=-5
2-4+|-5|=3

Answer 2

thanks!
i just clarified my answer :)