TS EAMCET · Maths · Application of Derivatives

The angle between the curves $2 x^{2} + y^{2} = 20$ and $4 y^{2} - x^{2} = 8$ at a point where they intersect in the $4^{th}$ quadrant is

A $0$
B $\frac{π}{2}$
C $\frac{π}{4}$
D $\frac{π}{6}$

Verified Solution

Answer & Solution

Correct Answer

(B) $\frac{π}{2}$

Step-by-step Solution

Detailed explanation

Given 4y2-x2=8 ⇒4y2-8=x2 (1) Given 2x2+y2=20 Using equation (1) ⇒24y2-8+y2=20 ⇒9y2=36 ⇒y2=4 ⇒y=±2 Substituting values in equation (1) ⇒44-8=x2 ⇒x2=8 ⇒x=±22 The intersection point in the…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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List-I		List-II
A)	$ω^{1010} + ω^{2000}$	I)	$0$
B)	$(1 + ω - ω^{2}) (1 - ω + ω^{2})$	II)	$1$
C)	${(2 + ω^{2} + ω^{4})}^{5}$	III)	$- 1$
D)	${(3 + 5 ω + 3 ω^{2})}^{3}$	IV)	$4$
		V)	$8$

The angle between the curves 2x2+y2=20 and 4y2-x2=8 at a point where they intersect in the 4th quadrant is

Step-by-step Solution

The angle between the curves $2 x^{2} + y^{2} = 20$ and $4 y^{2} - x^{2} = 8$ at a point where they intersect in the $4^{th}$ quadrant is