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Which of the following equations in para...

Which of the following equations in parametric form can represent a hyperbolic profile , where `t` is a parameter : `(A)x=a/2(t+1/t) & y=b/2(t-1/t)` `(B)tx/a-y/b+t=0 & x/a+ty/b-1=0` `(C)x=e^t+e^(-t) & y=e^t-e^(-t)` `(D)x^2-6=2cost & y^2+2=4cos^(t/2)`

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