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Mathematics · 2026 · 1 mark
CBSE 2026 · Region 3 · Set 1 · Q20
Assertion (A) : $\displaystyle \tan 2 \theta$ is not defined at $\displaystyle \theta=45^{\circ}$.
Reason (R) : $\displaystyle \sin 90^{\circ} \neq \cos 90^{\circ}$.
Official answer
From CBSE’s own marking scheme for this paper.
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
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CBSE Class 10 Mathematics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.