could you please help me to solve thease 4 DEs :
1. i've integrated the last function with maple but the result was very complicated and an answer in my book was simple, but i can't see it.
2.how can i get the other solutions? in the answers there was mentioned something with ln.
3. what i am doing wrong, because answer in the book is something else, like sin and sh functions.
4.what should i do next?