Book: RS Aggarwal - Mathematics
Chapter: 4. Inverse Trigonometric Functions
Subject: Maths - Class 12th
Q. No. 3 C of Exercise 4C
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3 C
Prove that:
To Prove: 
Formula Used: 
Proof:
LHS 
… (1)
Let x = tan A … (2)
Substituting (2) in (1),
LHS 
= tan-1 (tan 3A)
= 3A
From (2), A = tan-1 x,
3A = 3 tan-1 x
= RHS
Therefore, LHS = RHS
Hence proved.
Chapter Exercises
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