Write equations of cosine functions using properties
Find an equation for a sinusoidal function that has period 2𝜋, amplitude 1, and contains the point (𝜋,4)
4 = Cos(pi+C)+D
4= Cos (pi+0) +D
4= Cos (pi)+D
4= (-1) +D My misunderstanding is how to arrive at -1 ???