Sec 2 Pi 4
w Is counting seconds
Second 2
Sec 2 (pi / 4) = 1 / cos 2 (pi / 4) = 1 / cos 2 (pi / 4) because cos (a) = cos (a)
In this case, the expression is equal to ve 2.
tan² x + 1 = dry ² x
1 + 1 = seconds ² x
Seconds x = ± ˆš2
cos x = ± 1 / ˆš2
x = € / 4, 3Â / 4, 5Â / 4, 7Â / 4
