NCERT Solutions for Class 10 Maths Chapter 8
Important NCERT Questions
Introduction Trigonometry
NCERT Books for Session 2022-2023
CBSE Board and UP Board Others state Board
EXERCISE 8.3
Page No:187
Questions No:4
If tan A = cot B, prove that A + B = 90°.
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Given that: tan A = cot B
⇒ cot (90° – A) = cot B [∵ cot (90° – θ) = tan θ]
⇒ 90° – A = B ⇒ 90° = A + B
Hence, A + B = 90°
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