Find the exact value of the trigonometric expression without the use of a calculator.cos (165°) cos (45°) + sin (165°) sin (45°)
A. -2
B. - 
C. - 
D. - 
Answer: B
Mathematics
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Use Gauss's Divergence Theorem to calculate 
.F(x, y, z) = x2yzi + xy2zj + xyz2k, S is the box 0 ? x ? 1, 0 ? y ? 3, 0 ? z ? 1.
A. 27
B. 54
C. 
D. 
Mathematics
Factor completely.2x2 - 6xy - 8y2
A. (2x - 2y)(x + 4y) B. 2(x + y)(x - 4y) C. 2(x - y)(x + 4y) D. prime
Mathematics
Find 
and 
.f(x, y) = 
A. 
= 
; 
= 
B. 
= - 
; 
= - 
C. 
= - 
; 
= - 
D. 
= - 
; 
= - 
Mathematics
The median for this set of numbers: 1.5cc, 4.0cc, 6.5cc, 8.0cc, 8.0cc, 8.0cc, 10.5cc, 12.0cc, 12.0cc; is
A. 8.0cc B. 8.0cc and 12.0cc C. 7.8cc D. none
Mathematics