Without graphing the function, determine its amplitude or period as requested.y = -2 cos xFind the period.
A. ?
B. 2
C. 
D. 2?
Answer: D
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Use integration by parts to establish a reduction formula for the integral.
A. 
= - 2xn-1 e- x2 - 2(n - 1) 
B. 
= n xn-1 e- x2 + 2n 
C. 
= - 
xn e- x2 + 
D. 
= - 
xn-1 e- x2 + 
Determine whether the statement is true or false. If it is true, explain why it is true. If it is false, give an example to show why it is false.
?
If 
gives rise to a (constrained) relative extremum of 
subject to the constraint 
, then , 
and 
, simultaneously.
?
A. Let 
and 
, then the point 
gives rise to a (constrained) relative extremum(minimum), 
and 
, so the statement is false.
B. Let 
and 
, then the point 
gives rise to a (constrained) relative extremum(minimum), 
and 
, so the statement is true.
Solve the equation on the interval 0 ? ? < 2?.2 sin2 ? = 3(cos ? + 1)
A. 
B. 
C. 
D. 
Find the domain of the function.f(x) = 
A. {x|x ? 0} B. all real numbers C. {x|x > -15} D. {x|x ? -15}