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Which one of the following equation repr...

Which one of the following equation represent parametric equation to a parabolic curve? (a)`x=3cost ; y=4sint` `(b) x^2-2=2cost ; y=4cos^2(t/2)` (c)`sqrt(x)=tant ;sqrt(y)=sect` `(d)x=sqrt(1-sint ;)y=sint/2+cost/2`

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