Question

graph y = -3cosØ in the interval from 0 to 2π

Answer 1

All the coefficient of the trig function does it affect the amplitude. In other words, it only makes the crests and troughs of the wave reach higher and lower. The negative will also make the function "flip". This can be seen better by graphing the function. The black curve is cosx and the red is -3cosx.

Answer 2

thanks