Trigonometric graphs can be sketched when you know the amplitude, period, phase and maximum and minimum turning points. Learn about graphs of trigonometric functions in this National 5 Maths guide.
https://doi.org/10.4169/college.math.j.42.4.283 https://www.jstor.org/stable/10.4169/college.math.j.42.4.283 Summary Finding the sum of a series in the form of a ...