1. The problem statement, all variables and given/known data Solve the Given initial value problem 2. Relevant equations [tex] y' = tan ( x ), y ( pi / 4 ) = 3 [/tex] 3. The attempt at a solution Well I got the answer [tex] y = sec^2 ( x ) + 5 / 2 [/tex] The books answer is [tex] y = 3 - ln (sqrt(2) cos(x) ) [/tex] Where did I got wrong? Or is the book screwed up?