Question

If cos(t)= ign="absmiddle" class="latex-formula"> evaluate cos(-t) and sec(-t)

Answer 1

Answer:

cos(-t) = -4/9

sec(-t) = -9/4

Explanation:

Since cosine is an even function, we can say cos(-t) = cos(t) for all values of t. So this explains why cos(-t) = cos(t) = -4/9. No change happens.

To find the secant value, we apply the reciprocal. This is because sec = 1/cos. So that's how -4/9 flips to -9/4.