Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AP EAMCET201921 Apr 2019Evening ShiftMathematicsDifferentiationActual

If a ≠ b , x ≠ n π , n ∈ Z and y 2 = a 2 cos 2 x + b 2 sin 2 x , then d 2 y d x 2 + y =

Options

  1. Aa b y 2
  2. B1 y a b y 2
  3. C( a b ) 2 y
  4. Da b y 3

Correct answer

B. 1 y a b y 2

Step-by-step solution

It is given that, a ≠ b , x ≠ n π , n ∈ z and y 2 = a 2 cos 2 x + b 2 sin 2 x Differentiate the above equation w.r.t. x , 2 y d y d x = - a 2 sin 2 x + b 2 sin 2 x 2 y d y d x = b 2 - a 2 sin 2 x Again differentiate the above equation w.r.t. x , 2 y d 2 y d x 2 + d y d x 2 = 2 b 2 - a 2 cos 2 x y d 2 y d x 2 + d y d x 2 = b 2 - a 2 cos 2 x Multiply y 2 on both sides, y 3 d 2 y d x 2 + y 2 d y d x 2 = y 2 b 2 - a 2 cos 2 x y 3 d 2 y d x 2 = y 2 b 2 - a 2 cos 2 x - y 2 d y d x 2 Add y 4 in the

Practice Differentiation on Quantrex Academy →

More from Differentiation

The domain of the derivative of the function f(x)= x 1+|x| is 2025If x= 2^ cosec ⁻¹ t and y= 2^ ⁻¹ t ,|t| 1 then d y d x = 2025If (a+ 2 b x)(a- 2 b y)=a^2-b^2 where a>b>0 , then at ( 4 , 4 ) , dy dx = 2025If x y - y x =0 , then d y d x = 2025If y = ( _ x x )^ x , then dy dx = 2025If f(x)=x^ Sec ⁻¹ x , then f^ (2)= 2025If y= x^4 3 x-5 (x^2-3 )(2 x-3) , then ( d y d x )_ x=2 = 2025If x^2+y^2+ y=4 , then the value of d^2 y d x^2 at x=-2 is 2025 Full Differentiation list All AP EAMCET PYQs