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

question 439

Multiple Choice

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

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

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