CBSE 2025 · Region 4 · Set 2 · Q10 · 1 mark
Which of the following is a trigonometric identity ?
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle \sec ^{2} \theta=1+\tan ^{2} \theta$
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CBSE Class 10 Mathematics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.