Prove that ;
cos2A*cos3A-cos2A*cos7A/sin4A*sin3A -sin2A*sin5A = sin7A+sin3A/sinA

#12 find the value of x. #13 find the value of the variable.

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?

Find the area of an equilateral triangle with a side of 6 inches