Use a trigonometric substitution to evaluate the integral.
A. tan-1 7 - tan-1 
B. tan-1 2 - tan-1 7
C. tan-1 
- tan-1 7
D. 
tan-1 7 - 
tan-1 
Answer: A
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A. 9.59 ft × 9.59 ft B. 23 ft × 23 ft C. 18.4 ft × 92 ft D. 9.59 ft × 23 ft
Factor out the largest common factor.a(7 - b) + c(7 - b)
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A. 79 B. -78 C. -79 D. -1