Complete the left-hand column of the table below following the steps indicated in the right-hand column to show that sin a sin b = 1/2[cos(a-b)-cos(a+b)] is an identity. use the definitions of sum and difference formulas for cosine.

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

The value of cos 30° is the same as which of the following?

Find the value of x in the diagram below. select the best answer from the choices provided