Svar:
# Dy / dx = - (2sin (x-y) + 2xcos (x-y)) / (1-2xcos (x-y)) #
Forklaring:
Vi kan omarrangere og forenkle for at få:
# -2xsin (x-y) = y #
# D / dx y = d / dx -2xsin (x-y) #
# D / dx y = d / dx -2x sin (x-y) -2xd / dx sin (x-y) #
# D / dx y = - 2sin (x-y) -2xd / dx sin (x-y) #
# D / dx y = - 2sin (x-y) -2xcos (x-y) d / dx x-y #
# D / dx y = - 2sin (x-y) -2xcos (x-y) (d / dx x -d / dx y) #
# D / dx y = - 2sin (x-y) -2xcos (x-y) (d / dx x -d / dx y) #
Ved hjælp af chqain-reglen får vi det # D / dx = dy / dx * d / dy #
# Dy / dxd / dy y = - 2sin (x-y) -2xcos (x-y) (1-dy / dxd / dy y) #
# Dy / dx = -2sin (x-y) -2xcos (x-y) (1-dy / dx) #
# Dy / dx = -2sin (x-y) -2xcos (x-y) + 2xcos (x-y) dy / dx #
# Dy / dx-2xcos (x-y) dy / dx = -2sin (x-y) -2xcos (x-y) #
# Dy / dx 1-2xcos (x-y) = - 2sin (x-y) -2xcos (x-y) #
# Dy / dx = - (2sin (x-y) + 2xcos (x-y)) / (1-2xcos (x-y)) #
