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Which of the following is true for all values of $\theta$ ($0^\circ \le \theta \le 90^\circ$) ?
- (a)$\cos^2\theta - \sin^2 \theta = 1$
- (b)$\text{cosec}^2\theta - \sec^2\theta = 1$
- (c)$\sec^2\theta – \tan^2 \theta = 1$
- (d)$\cot^2\theta - \tan^2\theta = 1$
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(c) $\sec^2\theta – \tan^2\theta = 1$