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[" 12."sin^(2)x+2cos y+xy=0],[+xy=y]...

[" 12."sin^(2)x+2cos y+xy=0],[+xy=y]

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sin^(2)y + cos xy = k

If sin^(2)x+2cos y+xy=0 then (dy)/(dx)=

(y+ x (dy)/(dx)) sin xy =cos x, " when " x= 0 , y =0

cos (x + y), sin (x + y), - cos (x + y) sin (xy), cos (xy), sin (xy) sin2x, 0, sin2y] | = sin2 (x + y)

If a = x cos ^ (2) a + y sin ^ (2) A then (xa) (ya) + (xy) ^ (2) sin ^ (2) A cos ^ (2) A =

sin(xy) + (x)/(y) = x^(2) - y

sin x-cos y = p, cos x + sin y = q, thentan (xy) / (2) =