Use the product-to-sum and sum-to-product identities to prove the stated identity.-cot 
= 
What will be an ideal response?
= 
= - 
= -cot 
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Find the slope of the line going through the given pair of points.(-2, 2) and (-6, 2)
A. 4 B. 0 C. Undefined D. -4
Solve the problem.
The graph models the average amount spent annually on entertainment per household in Country X from 1981 to 1987. (i) Find the slope of the line. (ii) Find a point-slope form for the line. (Answers may vary.)
A. Slope is 675; point-slope form is y = 675(x - 1982) + 1500. B. Slope is 825; point-slope form is y = 825(x - 1984) + 2850. C. Slope is 375; point-slope form is y = 375(x - 1982) + 1500. D. Slope is 525; point-slope form is y = 525(x - 1984) + 2850.
Divide, if possible. If not possible, write "not defined." 
A. 1301 R 6 B. 1299 R 1 C. 1299 D. 1301
Determine whether the lines through each pair of points are perpendicular.(7, -1) and (5, 11); (4, -2) and (10, -1)
A. perpendicular B. not perpendicular