[Solved] Let f be a real-valued differentiable function on R (the set of all real numbers) such that f(1) = 1. If the y-intercept of the tangent at any point P(x, y) on the curve y= f(x) is equal to the cube of the abscissa of P, then the value off(-3) is equal to - - JEE (Advanced) 2010 Paper-1