Question

Express each of the following in terms of sinθ and/or cosθ.

a) cosθ1/sec

Answer 1

is this
\[\cos(x)\times \frac{1}{\sec(x)}\] ?

Answer 2

it is unclear from what you wrote, but if that is it, secant is the reciprocal of cosine, so your answer would be
\[\cos(x)\times \cos(x)=\cos^2(x)\]