Trigonometric Ratios CBSE NCERT Solutions Chapter 8 Exercise 8.1 Question 8
8. If 3 cot A = 4, check whether (1-
) / (1+
) =
or not.
Solution:
,
cot A = (Side Adjacent to Angle A) / (Side Opposite to Angle A) =
Let AB = 4k and BC = 3k as we are given that
Using Pythagoras Theorem on
, we get
cot A =
Because, tan A =
cos A = (Side Adjacent to Angle A) / (Hypotenuse) =
sin A = (Side Opposite to Angle A) / (Hypotenuse) =
(1-
) / (1+
) =
(1)
(2)
From (1) and (2), we can say that
(1-
) / (1+
) =
priya says
thanx for helping me