If the common difference of an A. P. is
\( \mathrm{P} \)
1 and \( 6... VIDEO
If the common difference of an A. P. is
\( \mathrm{P} \)
1 and \( 6^{\text {th }} \) term is \( \frac{\left(4 \cos ^{2} \alpha+1\right)}{\cos ^{2} \alpha} \), then the first term
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is, where \( \alpha \neq(2 n+1) \frac{\pi}{2} \)
(1) \( \sec ^{2} \alpha \)
(2) \( \tan ^{2} \alpha \)
(3) \( \cot ^{2} \alpha \)
(4) \( \operatorname{cosec}^{2} \alpha \)
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