Express the following as a function of a single angle.
Cos^2(81°) - sin^2(81°)

Which sentence uses an objective tone? we will plant the best garden of any school in the area. the new campus garden will surely be envied by other schools. a garden would provide numerous benefits to the students. you will probably agree that gardens have many benefits.

Aplane intersects a pris paralel to the base of the prism. the cross section is a polygon wth eight sides. how many sides does the base of the prism have? a. 10 b. 8 c. 7 d. 9

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.