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JFonseka
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Homework Statement
By multiplying the integrand sec x dx by [tex]\frac{tan x + sec x}{tan x + sec x}[/tex] find the integral of sec x dx
Homework Equations
d/dx sec x = tan x.sec x
d/dx tan x = sec^2 x
The Attempt at a Solution
sec x dx([tex]\frac{tan x + sec x}{tan x + sec x}[/tex]) =>
[tex]\frac{tan x.sec x + sec^2 x}{tan x + sec x}[/tex]dx
Just noticed the numerator is the derivative of the denominator, so =>
[tex]\frac{d(sec x + tan x)}{sec x + tan x}[/tex]dx
Not sure what to do from here...
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