A point on the terminal side of angle ? is given. Find the exact value of the indicated trigonometric function of ?.(21, 28) Find cos ?.
A. 
B. 
C. 
D. 
Answer: A
Mathematics
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Evaluate the expression.71
A. 7
B. 1
C. -7
D. 
Mathematics
Provide an appropriate response.Add the following: 56.76 + 7.7
A. 57.53 B. 64.46 C. 13.376 D. 63.146 E. none of the above
Mathematics
Determine if the given function y = f(x) is a solution of the accompanying differential equation. y' - y = 3ex y = ex + 3xex
A. Yes B. No
Mathematics
Find all numbers that are not in the domain of the function. Then give the domain using set notation.f(x) = 
A. -7, 7; {x|x ? -7, 7} B. -9; {x|x ? -9} C. 7; {x|x ? 7} D. none; (-?, ?)
Mathematics