CBSE 2025 · Region 5 · Set 1 · Q12 · 1 mark
$\displaystyle \frac{1-\tan ^{2} 30^{\circ}}{1+\tan ^{2} 30^{\circ}}$ is equal to
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle \cos 60^{\circ}$
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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.