Question on: JAMB Mathematics - 1998

Differentiate \(\frac{x}{cosx}\) with respect to x
A
1 + x sec x tan x
B
1 + sec2 x
C
cos x + x tan x
D
x sec x tan x + secx
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Correct Option: D
let y = \(\frac{x}{cosx}\) = x sec x

y = u(x) v (x0

\(\frac{dy}{dx}\) = U\(\frac{dy}{dx}\) + V\(\frac{du}{dx}\)

dy x [secx tanx] + secx

x = x secx tanx + secx

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