Fourier transform properties

well I am having a problem with fourier transforms and their properties, the ones relating the fourier transform of a function and the one of its integral and derivative. in the image I'll link here( http://dl.dropbox.com/u/27392043/IMG_0008.JPG ) I have a solution of a probem witch consists on determining the fourier transform of a funcion x(t) by means of its derivative's or integral's transform. I solve both ways and I somehow get different answers, can anyone tell me what's the problem with my solutions? thank you very much