A phase shift to the left of π/3 units transforms the parent cosine function into function m as,m(x)= cos(3x-π). Option A is correct.
What exactly is a function?
A function is a statement, rule, or law that specifies the connection between two variables. Functions are common in mathematics and are required for the formulation of physical connections.
The standard equation for the cos function is;
m(x)= cos(x-∅)
For the given function,a phase shift to the left of π/3 units transforms the parent cosine function into function m as;
m(x)= cos(x-(π/3))
m(x)= cos(3x-π)
Hence option A is correct.
To learn more about the function, refer to:
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