A hyperbola is not a cubic function. A cubic function is of the form y = ax3 + bx2 + cx + d where a, b, c and d are real constants and a is not 0. A hyperbola is a functon of the form y = 1/x : quite different.
the graph of cos(x)=1 when x=0 the graph of sin(x)=0 when x=0. But that only tells part of the story. The two graphs are out of sync by pi/2 radians (or 90°; also referred to as 1/4 wavelength or...