The equation you provided is a combination of cosine and sine functions. The general form of this function is:
[ y = A\cos (Bx) + C\sin (Dx) ]
In your case, (A = 1), (B = 18), (C = -1), and (D = 18). Therefore, the equation can be written as:
[ y = \cos(18x) - \sin(18x) ]
The equation you provided is a combination of cosine and sine functions. The general form of this function is:
[ y = A\cos (Bx) + C\sin (Dx) ]
In your case, (A = 1), (B = 18), (C = -1), and (D = 18). Therefore, the equation can be written as:
[ y = \cos(18x) - \sin(18x) ]