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If f(x)=lim(y->x) (sin^2y-sin^2x)/(y^...

If `f(x)=lim_(y->x) (sin^2y-sin^2x)/(y^2-x^2),` then `int \ 4x f(x) dx` equals (i)`cos2x+C` (ii)`2cos2x+C` (iii)`-cos2x+C` (iv)`-2cos2x+C`

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