CUET · MATHS · PYQ PAPER 2023

For any real numbers x and y, we define x R y if and only if \(\operatorname{cosec}^2 x-\cot ^2 y=1\). The relation R is:

A Reflexive but not transitive
B Symmetric but not reflexive
C both reflexive and symmetric but not transitive
D an equivalence relation

Verified Solution

Answer & Solution

Correct Answer

(D) an equivalence relation

Step-by-step Solution

Detailed explanation

Reflexivity: \(x R x \iff \operatorname{cosec}^2 x - \cot^2 x = 1\). This is a trigonometric identity (\(\operatorname{cosec}^2 \theta = 1 + \cot^2 \theta\)). Thus, R is reflexive. Symmetry: \(x R y \iff \operatorname{cosec}^2 x - \cot^2 y = 1\).…

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.

Same subject

Match List-I with List-II

List I (Function)	List II (Derivative with respect to ' x ')
(A) \(f(x)=x^x\)	(I) \(a x^{a-1}\)
(B) \(f(x)=a^x\)	(II) 0
(C) \(f(x)=a^a\)	(III) \(a^x \log _e a\)
(D) \(f(x)=x^a\)	(IV) \(x^x\left(1+\log _e x\right)\)

Choose the correct answer from the options given below:

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