I do understand what you said about the substitution of 3x for x in your explanation. Where I am getting confused is the relationship between these two forms of the equation; the general equation form C + A cos B (X-D) where B is the reciprocal of the period and the solution with the 3X in the...
but isn't 3 the reciprocal of the horizontal dilation? ie B in the general sinusoidal equation: y = C+A*cosB(X-D)
If 3 is the reciprocal of the horizontal dilation, how can I simply place it into the (x-D) portion of the equation?
Thanks
guns4monkeys
Homework Statement
The textbook problems states: y=cos3x +sin3x and you are to combine it to a single cos function and tell what effect the 3 has. The answer in the back of the book is given as sqrt2*cos(3x-pi/4) and that the 3 means the wave has a horizontal dilation of 1/3...