1.

Evaluate:`int(secx)/(secx+tanx)dxdot`

Answer» `int(secx)/(sec x +tan x)dx=int(secx(secx-tanx))/((secx+tanx)(secx-tanx))dx`
`=int(sec^(2)x-secxtanx)/(sec^(2)x-tan^(2)x)dx`
`=int sec^(2)xdx-intsecx tanx dx`
`=tanx - secx +C`


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