Integral for a differential equation problem

  • Thread starter sihag
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Main Question or Discussion Point

i'm stuck on this relatively simply integral for a differential equation problem ...

| du / cos(pi/4 - u )
where | denotes the integral sign

some help ?
 

Answers and Replies

tiny-tim
Science Advisor
Homework Helper
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∫ du / cos(π/4 - u)
Hi sihag! :smile:

Hint: substitute v = u - π/4. :smile:

(and copy the symbols below for future use! :smile:)
 
Gib Z
Homework Helper
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After letting [itex]\frac{\pi}{4} - u =x[/itex], all you need to know is [tex]\int \frac{1}{\cos x} dx = \log_e | \frac{1+\sin x}{\cos x} | + C[/tex].
 
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