"B. f^{_{y}^{'}}=5cos(2x+y)-10sin(x-y)."
"C. f^{_{xx}^{''}}=-20sin(2x+y)+10cos(x-y)."
"D. f^{_{yy}^{''}}=-5sin((2x+y)+10cos(x-y)."
"E. f^{_{yx}^{''}}=-10sin(2x+y)-10cos(x-y)."
"F. f^{_{xy}^{''}}=-10sin(2x+y)-10cos(x-y)."
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