KCET2018MathematicsInverse Trigonometric Functions
The value of the expression ( ( 1 2 ⁻¹ 2 5 ) ) is
Options
- A( 12- 5 )
- B( 5 -2 )
- C( 5 -2 2 )
- D( 5- 2 )
Correct answer
B. ( 5 -2 )
Step-by-step solution
Given that ( ( 1 2 ⁻¹ 2 5 ) ) Let ( ⁻¹ ( 2 5 )= ) then, ( = 2 5 ) So, ( ( 1 2 ⁻¹ 2 5 )= ( 1 2 ) ) We know that, ( = 1- 2 1+ 2 ) So, ( ( 1 2 )= 1- 1+ ) ( = 1- 2 5 1+ 2 5 = 5 -2 5 +2 ) ( = 5 -2 5 +2 5 -2 5 -2 ) ( = 5 -2 1 = 5 -2 )