Prove that: \frac{1}{1+ \sin \theta}+\frac{1}{1- \sin \theta}=2 \sec ^2 \theta

ICSE Class X Math 2022 Solved Paper - Question 11

Section-B

(Attempt any three questions from this Section.)
Question 2.

Question : 11 of 30

Marks: +1, -0

Prove that:

\;{1}/{1+ sin \;θ}+\;{1}/{1- sin \;θ}=2 \ sec ^2 θ

Solution:

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