it is the same as a sin function only shifted to the left pi/2 units
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Because it is the 'Complimentary' Sine curve. , hence the name 'CoSine'.
There are a couple of graphs you could use. A pie graph or a bar graph.
A zero of a function is a point at which the value of the function is zero. If you graph the function, it is a point at which the graph touches the x-axis.
Reciprocal of Cosine is Secant
Cosine of -90 is 0.