What functions are equivelent to y=4cosx-2
y=4cos(-x)-2
y=4sin(x+pi/2)-2
y=4sin(x-pi/2)-2
y=-4cosx+2

What functions are equivelent to y=4cosx-2
y=4cos(-x)-2
y=4sin(x+pi/2)-2
y=4sin(x-pi/2)-2
y=-4cosx+2

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cos(-x)=cos x . now try

so a and d work in that case?

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