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Solution
Expression : $$cot^{2}A-cos^{2}A = x$$
= $$\frac{cos^2A}{sin^2A} - cos^2A$$
= $$cos^2A(\frac{1}{sin^2A} - 1)$$
= $$cos^2A(\frac{1 - sin^2A}{sin^2A})$$
= $$cos^2A \times \frac{cos^2A}{sin^2A}$$
= $$cot^2Acos^2A$$
=> Ans - (C)
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