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2 x sin 2 ydx +cos 2 x cot 2 ydy = 0
¿ +sin( x + y )=sin ( x − y )
y ¿ sinx = ylny , y ∨¿ x = π 2
x − y
¿ =( 8 x + y + 1 ) 2
¿ − ysinx = sinxcosx
¿ +( 2 x − 1 ) y + 1 = 0
y ¿
2
¿ − y xlnx = xlnx , y ∨¿ x = e = e 2 2
¿ − y = e x sinx
¿ − y = 2 x 2 sin 5 x