The cosine function is even. This means that
\(\displaystyle{\cos{{\left(-\frac{\pi}{{6}}\right)}}}\) is the same thing as \(\displaystyle{\cos{{\left(\frac{\pi}{{6}}\right)}}}\).

asked 2021-05-31

Find an equation of the plane. The plane through the points (2, 1, 2), (3, −8, 6), and (−2, −3, 1)

asked 2021-03-12

Aidan knows that the observation deck on the Vancouver Lookout is 130 m above the ground. He measures the angle between the ground and his line of sight to the observation deck as \(\displaystyle{77}^{\circ}\). How far is Aidan from the base of the Lookout to the nearest metre?

asked 2021-07-02

Tell whether two angles can be as described. Justify your answers.

a. vertical and complementary

b. vertical and supplementary

c. complementary and supplementary

a. vertical and complementary

b. vertical and supplementary

c. complementary and supplementary

asked 2021-12-10

What are the 6 basic trigonometric functions related to right triangles?

asked 2021-12-23

The of a 15-foot ladder is 3 feet farther up a wall than the foot is from the bottom of the wall. How far is the ladder from the bottom of the wall?

asked 2021-12-17

What is the \(\displaystyle{\cot{{0}}}\)?