The derivative of \( f(x)=\tan \left(7 x^{2}\right) \) is \( \mathr...

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The derivative of \( f(x)=\tan \left(7 x^{2}\right) \) is
\( \mathrm{P} \)
(1) \( \sec ^{2}\left(7 x^{2}\right) \times 14 x \)
(2) \( -\sec ^{2}\left(7 x^{2}\right) \times 14 x \)
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(3) \( \sec ^{2}\left(7 x^{2}\right) \times 7 \)
(4) \( \operatorname{cosec}^{2}\left(7 x^{2}\right) \times 14 x \)
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