This is how to answer this question: sec(θ) = 1 / sin(90−θ)
sec(θ) = 1 / cos(θ)
and
sin(θ) = cos(90−θ)
by the complementary angle rule
cos(θ)=sin(90−θ)
so use this to express
sec(θ)
So this will give us,
sec(θ) = 1 / cos(θ)
sec(θ) = 1 / sin(90−θ)
Hope this helps answer your question.
