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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`

A

`x=3cost,y=4sint`

B

`x^(2)-2=2cost,y=4"cos"^(2)(t)/(2)`

C

`sqrt(x)=tant,sqrt(y)=sect`

D

`x=sqrt(1-sint),y="sin"(t)/(2)+"cos"(t)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
(2) `x=3cost,y=4sint`
Eliminating t, we have
`(x^(2))/(9)+(y^(2))/(16)=1`
which is an ellipse.
`x^(2)-2=2cost andy=4"cos"^(2)(t)/(2)`
`or" "y=2(1+cost)`
`and" "y=2(1+(x^(2)-2)/(2))`
which is a parabola.
`sqrt(x)=tant,sqrt(y)=sect`
Eliminating t, we have
y-x=1
which is a straight line.
`x=sqrt(1-sint)`
`y="sin"(t)/(2)+"cos"(t)/(2)`
Eliminating t, we have `x^(2)+y^(2)=1-sint+1+sint=2`
which is a circle.
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  • Which of the following is (are) a pair of parametric equation that represent a circle? {:{(x=sin theta),(y=cos theta):} {:{(x=t),(y=sqrt(1-t^(2))):} {:{(x=sqrt(s)),(y=sqrt(1-s)):}

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    B
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