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Maths CBSE Live product
Class 10 (2025-26)
Introduction to trigonometry
Annual Revision III - Introduction to trigonometry
5.
The concept of trigonometric identities.
Question:
3
m.
Simplify the following:
1.
\(\frac{\cos \theta}{1 + \sin \theta} + \frac{1 + \sin \theta}{\cos \theta}\)
\(=\)
\(sec \theta\)
\(2cosec \theta\)
\(2sec \theta\)
2.
\(\frac{\cot A}{\csc A - 1} + \frac{\cot A}{\csc A + 1}\)
\(=\)
\( \sec A\)
\(2 cosec A\)
\(2 \sec A\)
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