यदि sin⁻¹ (1- x) - 2 sin⁻¹ x = π2, तो x का मान बराबर है:
(A) 0, 12 (B) 1, 12 (C) 0 (D) 12
Answers
Given : sin⁻¹ (1- x) - 2 sin⁻¹ x = π/2,
To find : x का मान बराबर है: सही विकल्प चुनें
Solution:
sin⁻¹ (1- x) - 2 sin⁻¹ x = π/2
=> - 2 sin⁻¹ x = π/2 - sin⁻¹ (1- x)
=> - 2 sin⁻¹ x = Cos⁻¹ (1- x)
=> 2 sin⁻¹ x = -Cos⁻¹ (1- x)
दोनों तरफ Cos लेने पर
=> Cos(2 sin⁻¹ x) = Cos ( -Cos⁻¹ (1- x))
Cos2α = 1 - 2Sin²α , Cos(-α) = Cos(α)
α = sin⁻¹ x => sinα = x
=> 1 - 2x² = (1 - x)
=> 2x² - x = 0
=> x( 2x - 1) = 0
=> x = 0 , x = 1/2
sin⁻¹ (1- x) - 2 sin⁻¹ x = π/2,
x = 0
=> sin⁻¹ (1- 0) - 2 sin⁻¹ 0 = sin⁻¹ (1 ) - 2 sin⁻¹ 0 = π/2 - 0 = π/2
x = 1/2 => sin⁻¹ (1- 1/2) - 2 sin⁻¹ (1/2) = sin⁻¹ (1/2 ) - 2 sin⁻¹ (1/2) = π/6 - 2(π/6) = -π/6 ≠ π/2
x का मान = 0
सही विकल्प (C)
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