θ is an acute angle and sin θ and cos θ are given. Use identities to find the indicated value.
-$\cos 25 ^ { \circ } \sec 25 ^ { \circ }$
A) 1
B) 0
C) 25
D) $\cos ^ { 2 } 25 ^ { \circ }$

Question

Quizplus · Accepted Answer

The identity $\cos \theta \sec \theta = 1$ holds because $\sec \theta$ is defined as $1/\cos \theta$, making their product always equal to 1.

θ Is an Acute Angle and Sin θ and Cos cos⁡25∘sec⁡25∘\cos 25 ^ { \circ } \sec 25 ^ { \circ }cos25∘sec25∘

θ Is an Acute Angle and Sin θ and Cos $\cos 25 ^ { \circ } \sec 25 ^ { \circ }$