from problem 18 to 26 with complete procedure to reach the solution

SOL. SOL. 14. x cos? y dx + tan y dy = 0. SOL. x(y + 15. xayy' = ev. 16. tan? y dy = sen3 x dx. SOL. Cos3 x - 3 cos * = 17. y' = cost x cos y. SOL. 4 In (sec y + tan y) = 18. y' = y sec x. SOL. y = 19. dx = t(1 + +2) sec2 x dt. SOL. 2x + sen 2x 20. (e2# + 4 ) y' =y. SOL. y 21. adB + B da + aB(3 da + dB) = 0. SOL. caB = 22. (1 + Inx) dx + (1 + Iny) dy = 0. SOL. X 23. x dx - Vaz - x2 dy = 0. SOL. y - c = - Va - x2, la m circunferencia x2 24. x dx + Va2 - x2 dy = 0. SOL. y - c = Va2 - x2, la mi circunferencia x 25. a' dx = x V x2 - a2 dy. SO 26. y In x In ydx + dy = 0. SOL. x In x