(1) f(sin x) dx = f(cos x) dx
(2) f(sin 2x).sin x dx = f(sin 2x).cos x dx
(3)
(4)
(5) dx = dx =
(6) dx = dx =
(7)
(8) dx = dx =
(9)
(10) dx = dx =
(11) dx =
(12)
(13) dx = dx = dx = (a + b)
(14) log(1 + tan x) dx = log 2
(15) log(sin x) dx = log(cos x) dx = – log 2 = log ()
(16)