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" 8."y-cos y=xquad :quad (y sin y+cos y+...

" 8."y-cos y=xquad :quad (y sin y+cos y+x)y'=

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y - cos y = x : (y sin y + cos y + x)y' = y

y - cos y = x : (y sin y + cos y + x)y' = y

y - cos y = x : (y sin y + cos y + x)y' = y

y - cos y = x : (y sin y + cos y + x)y' = y

y-cos y=x:(y sin y+cos y+x)y'=y .

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

Prove that (i) 2 cos x cos y=cos (x+y)+cos (x-y) (ii) -2 . sin x sin y=cos (x+y)-cos (x-y) (iii) 2 sin x cos y=sin (x+y)+sin (x-y) (iv) 2 cos x sin y=sin (x+y)-sin (x-y)

Solve the following differential equations y{x cos (y/x)+y sin (y/x)}dx- x{ y sin (y/x)-x cos (y/x)}dy=0 .

What ( sin x cos y + cos x sin y) (sin x cos y - cos x sin y) equal to ?

The solution of (dy) / (dx) + (y cos x + sin y + y) / (sin x + x cos y + x) = 0 is