Simplify the rational expression. If the rational expression cannot be simplified, so state.
A. 
B. x + 12
C. 
D. cannot be simplified
Answer: C
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Use the product-to-sum and sum-to-product identities to prove the stated identity.cot 
cot 
= 
What will be an ideal response?
Estimate the value as a whole number or as a mixed numeral where the fractional part is 
.16
+ 12
A. 28
B. 28
C. 29
D. 29
Add or subtract as indicated. Simplify the result, if possible.
- 
A. 
B. - 
C. - 
D. 
Decide whether the following problem can be solved using precalculus, or whether calculus is required. If the problem can be solved using precalculus, solve it. If the problem seems to require calculus, use a graphical or numerical approach to estimate the solution.
?
Find the area of the shaded region. Round your answer to the whole number.
?
?
A. calculus , 11 B. precalculus , 11 C. precalculus , 13 D. calculus , 16 E. precalculus , 16