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If $\theta$ is an acute angle of a right angled triangle, then which of the following equation is not true?
- (a)$\sin \theta \cot \theta = \cos \theta$
- (b)$\cos \theta \tan \theta = \sin \theta$
- (c)$\text{cosec}^2 \theta - \cot^2 \theta = 1$
- (d)$\tan^2\theta-\sec^2 \theta = 1$
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(D) $\tan^2\theta- \sec^2 \theta = 1$