Decide what quadrants this can be in. Decide if sec can be pos or neg or either.
NOW
Draw a tight angled triangle.
Label one of the acute angles x
now $$tan x = \frac{1}{2}=\frac{opp}{adj}$$
label the opp side as 1 and the adj side as 2, work out the 3rdside using the Pythagorean theorem.
$$sec(x)=\frac{1}{cos(x)}=\frac{hyp}{adj}$$ now just take the values from your triangle. :))
Decide what quadrants this can be in. Decide if sec can be pos or neg or either.
NOW
Draw a tight angled triangle.
Label one of the acute angles x
now $$tan x = \frac{1}{2}=\frac{opp}{adj}$$
label the opp side as 1 and the adj side as 2, work out the 3rdside using the Pythagorean theorem.
$$sec(x)=\frac{1}{cos(x)}=\frac{hyp}{adj}$$ now just take the values from your triangle. :))