Book: RS Aggarwal - Mathematics
Chapter: 4. Inverse Trigonometric Functions
Subject: Maths - Class 12th
Q. No. 7 E of Exercise 4C
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7 E
Prove that:
To Prove: 
Formula Used: 
Proof:
LHS 
… (1)
Let 
Therefore 
… (2)
From the figure, 
… (3)
From (2) and (3),
Substituting in (1), we get
LHS 
= tan-1 1
= RHS
Therefore, LHS = RHS
Hence proved.
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