Answer:
Step-by-step explanation:
Given the solution to the equation y to be cos⁻¹(1)
y = cos⁻¹(1)
y =0°
In trigonometry identity, the general solution for cosine function is expressed as θ = 2kπ ± n, where n is any integer.
Substituting the solution gotten to the equation above into the general formula θ = 2kπ ± n, will give;
y = 2kπ ± n
since we have just one solution, we will find the value of y at n = 0
y = 2kπ ± 0
y = 2kπ