Pick the incorrect trigonometric identity

1. A.
   $\sec^2\theta - \tan^2\theta = 1$
2. B.
   $\sin^2\theta + \cos^2\theta = 1$
3. C.
   $\text{cosec}^2\theta - \cot^2\theta = 1$
4. D.
   $\sec^2\theta + \cos^2\theta = 1$

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1. A.
   $\tan^2 A = 1 - \sec^2 A$
2. B.
   $\sin A = \tan A \times \cos A$
3. C.
   $\text{cosec}^2 A - 1 = \cot^2 A$
4. D.
   $\cos A \times \sec A = 1$

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1. A.
   $1 + \cot^2\theta \equiv \text{cosec}^2\theta$
2. B.
   $1 + \tan^2\theta \equiv \sec^2\theta$
3. C.
   $1 - \sin^2\theta \equiv \cos^2\theta$
4. D.
   $\cos^2\theta - \sin^2\theta \equiv 1$

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