12 y x2 cosx 2x senx 2cosx y 2x cosx x2 senx 2 senx 2x cosx 2 senx y 2x cosx x2 senx 2 senx 2x cosx 2 senx y x2 senx 13 s tg t et s sec2 t et 1 s sec2 t et
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12 y x2 cosx 2x senx 2cosx y 2x cosx x2 senx 2 senx 2x cosx 2 senx y 2x cosx x2 senx 2 senx 2x cosx 2 senx y x2 senx 13 s tg t et s sec2 t et 1 s sec2 t et