Prove the identity.cot ( x + y) cot (x - y) = 
What will be an ideal response?
cot ( x + y) cot (x - y) = 
? 
= 
.
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Solve the problem.The apportionment of the 435 seats in a certain country's representative government is determined by the total population counts in each district. The table shows the number of representatives for selected districts based on the 2000 census and the 2010 census. 
Which districts gained representatives as a result of the 2010 census?
A. 1, 12 B. 1, 12, 18 C. 4, 13, 18, 22 D. 1, 12, 39
Find the area enclosed by the given curves.y = x, y = x2
A. 
B. 
C. 
D. 
Simplify the expression. Write the result using positive exponents only.-4z-2
A. - 
B. 
C. 
D. - 
Solve the following equations for x and y:
2x - 2y = 10; 3x + y = 7 a. x = -2 y = 2 b. x = 2 y = -3 c. x = -3 y = 3 d. x = 3 y = 2 e. x = 3 y = -2