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Mathematics · 2026 · 2 marks
CBSE 2026 · Region 2 · Set 3 · Q25
(a) If tan A =4/3, find sin A and cos A.
(a)
If $\displaystyle \tan \mathrm{A}=\frac{4}{3}$, find $\displaystyle \sin \mathrm{A}$ and $\displaystyle \cos \mathrm{A}$.
OR
(b)
Express cos A and tan A in terms of $\displaystyle \sin \mathrm{A}$.
Marking-scheme solution
(a)
\(\displaystyle \sin \mathrm{A}=\frac{4}{5}\)
\(\displaystyle \cos \mathrm{A}=\frac{3}{5}\)
OR
(b)
\(\displaystyle \cos \mathrm{A}=\sqrt{1-\sin ^{2} \mathrm{~A}}\)
\(\displaystyle \tan \mathrm{A}=\frac{\sin \mathrm{A}}{\cos \mathrm{A}}=\frac{\sin \mathrm{A}}{\sqrt{1-\sin ^{2} \mathrm{~A}}}\)
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CBSE Class 10 Mathematics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.