यदि ` y = x^(3) + tan x ` हो , तो ` (d^(2)y)/(dx^(3))` ज्ञात कीजिए ।

Explanation

` :' y=x^(3) +tan x `
` :. (dy)/(dx) = 3x^(2) +sec^(2) x`
पुनः ` (d^(2)y)/(dx^(2)) = 6x+2 sec x d/(dx) sec x `
` = 6x+ 2 sec x xx sec x tan x `
` = 6x + 2 sec^(2) x tan x . `