Question
If y= 2 1+ + , then value of 1- + 1+ is
BITSAT
Mathematics
Trigonometric Equations
2021
BITSAT 2021
BITSAT Mathematics Question (2021) — Solution
Options
- A. y 3
- B. y
- C. 2 y
- D. 3 2 y
Answer
B. y
Step-by-step solution
1- + 1+ = 1- + 1+ 1+ + 1+ + = (1+ )^ 2 - ^ 2 (1+ )(1+ + ) = (1+ ^ 2 +2 )- (1- ^ 2 ) (1+ )(1+ + ) = 2 1+ + =y
Related: Mathematics — Trigonometric Equations · All PYQ Banks