Introduction to Trigonometry

CBSE Class 10 · Mathematics · 60 past questions

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1. Q9 2026

   Prove that : $\sqrt{\dfrac{1+\sin A}{1-\sin A}} = \sec A + \tan A$

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2. Q10 2026

   Prove that : $\frac{\sin\theta-\cos\theta+1}{\sin\theta+\cos\theta-1}=\frac{1}{\sec\theta-\tan\theta}$

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3. Q14 2026 (Basic)

   Prove that $\frac{\cot A - \cos A}{\cot A + \cos A} = \frac{\sec A - \tan A}{\sec A + \tan A}$

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4. Q29 2025

   Prove that…

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5. Q32 2025 (Basic)

   Prove that…

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6. Q43 2024

   Prove that : tanθ/(1-cotθ) + cotθ/(1-tanθ) = 1 + secθ cosecθ

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7. Q47 2024 (Basic)

   Prove that : $(\cot\theta-\operatorname{cosec}\theta)^2=\dfrac{1-\cos\theta}{1+\cos\theta}$.

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8. Q57 2023

   Prove that : $\frac{\tan\theta+\sec\theta-1}{\tan\theta-\sec\theta+1}=\frac{1+\sin\theta}{\cos\theta}$

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9. Q60 2023 (Basic)

   Prove that…

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