If cos(t)= -(4/9) , evaluate cos (-t) and sec (-t).

Question

cos(-t) = ?

sec(-t) = ?

Answer 1

If cos(t)= -(4/9) , evaluate cos (-t) and sec (-t).

cos(-t) = ?sec(-t) = ?

cos(-t) is -(4/9) in the 2nd or 3rd quadrant

Then cos(-t) is in the 1st or 4th quadrant,

but the sec(-t) is positive in the 1st or 2nd quadrant.