RD Sharma - Mathematics (Volume 1)

Book: RD Sharma - Mathematics (Volume 1)

Chapter: 4. Inverse Trigonometric Functions

Subject: Maths - Class 12th

Q. No. 4 of Exercise 4.13

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4

Prove that: cos–1 4/5+cos–1 12/3=cos–1 33/65

Given:-


Take


LHS



We know that, Formula



Thus,


=



=


=


=


= RHS


So,



Hence Proved


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