Use a sum or difference identity to find the exact value.sin 
A. 
B. 
C. 
D. - 
Answer: C
You might also like to view...
Find all the second order partial derivatives of the given function.f(x, y) = cos (xy2)
A. 
= - y2 sin xy2; 
= 2y
; 
= 
= 2
B. 
= - y2 sin xy2; 
= 2[ sin (xy2)- 2y2 cos (xy2)] ; 
= 
= 2y [sin (xy2)-y2 cos (xy2)]
C. 
= -y4 cos xy2; 
= - 2x[2xy2 cos (xy2) + sin(xy2)]; 
= 
=
- 2y[xy2 cos (xy2) + sin(xy2)];
D. 
= y2 sin xy2; 
= 2[2y2 cos (xy2) - sin (xy2)] ; 
= 
= 2y[y2 cos (xy2) - sin (xy2)]
Mark as true any statement that is always true. Mark as false any statement that is never true or that is not necessarily true. Be able to justify your answers.
1. When you are asked to make a generalization, you should use the Guess and Test problem-solving strategy. 2. If a problem involves a large array or diagram, a good strategy to try is “Use a Variable.” 3. If a problem involves a physical situation, the “Draw a Picture” strategy may be appropriate. 4. If a problem involves a sequence of numbers or figures, the “Draw a Picture” strategy may be appropriate.
Solve.A balloon is secured to rope that is staked to the ground. A breeze blows the balloon so that the rope is taut while the balloon is directly above a flag pole that is 40 feet from where the rope is staked down. Find the altitude of the balloon if the rope is 110 feet long.
A. 10
ft
B. 10
ft
C. 
ft
D. 5
ft
Find the median. If necessary, round to one decimal place.50, 17, 2, 1, 28, 12, 25, 39, 38, 32
A. 28 B. 25 C. 26.5 D. 24.4