Question

Integration evaluation

Answer 1

\[\int\limits_{?}^{?} \frac{ 1 }{ \cos(x-a) \cos(x-b) }\]

Answer 2

you know what is
cos A cos B formula ?
apply it here

Answer 3

ok lets try.

Answer 4

cos (A+B)+cos (A-B)

Answer 5

half of that

Answer 6

note while doing A_B, the x will cancel out

Answer 7

hey, how about multiplying both numerator and denominator by sin(a-b) and then convert it into sin { (x-a) - (x-b) }

Answer 8

sorry by sin (b-a)

Answer 9

that might work, let me try...my method is a bi lengthy one

Answer 10

yes, thats simplifies nicely

Answer 11

ok, let me complete it..

Answer 12

@hartnn