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If , show that .
If $y = x + \tan x$, show that $\cos^2 x \frac{d^2 y}{dx^2} - 2y + 2x = 0$.
Given: $y = x + \tan x$
To show: $\cos^2 x \frac{d^2 y}{dx^2} - 2y + 2x = 0$
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From ISC 2026 Improvement Mathematics Paper 1, question 9.