Sec(2a0)=Sec^a/2-sec^2a
looks like nobody has been able to decipher your typing.
At least I don't know what your equation says. (there are at least 3 ways I could read the right side of your equation, and the left side makes even less sense)
At least I don't know what your equation says. (there are at least 3 ways I could read the right side of your equation, and the left side makes even less sense)