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:190
Questions No:6
If A, B and C are interior angles of a triangle ABC, then show that Sin(B+C/2) = cos A/2.
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LHS = sin((B+C)/2)
= sin ((180°-A)/2) [∵ A +B +C = 180°]
= sin (90°- A/2)
= cos A/2 = RHS [∵ sin (90° – 0) = cos 0]
Here is the explanation video of the above question😎👇
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