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Select the Functions That Have Identical Graphs y=cos⁡xy = \cos x

Question 439

Multiple Choice

Select the functions that have identical graphs.
-(i) y=cos⁡xy = \cos x
(ii) y=−sin⁡(x−π) y = - \sin ( x - \pi )
(iii) y=cos⁡(x−π2) y = \cos \left( x - \frac { \pi } { 2 } \right)


A) i\mathrm { i } and iii
B) ii and ii
C) ii and iii
D) ii , ii and iii

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