Trigonometric Ratios CBSE NCERT Solutions Chapter 8 Exercise 8.3 Question 6
6. If A, B and C are interior angles of a triangle ABC, then show that
Solution:
It is given that
(1)
We are given that A, B and C are interior angles of a triangle ABC.
Therefore,
(2)
L.H.S =
Putting (2) in (1), we get
L.H.S =
=R.H.S
{sin(90
-A) = cos A}
Hence Proved
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