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Exam
show that line perpendicular to x-axis and a line perpendecular to y-axis having slope multipication -1
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f(x+y) = f(x) + f(y) + 2xy - 1 " x,y. f is differentiable and f'(0) = cos a. Prove that f(x) > 0 " x Î R.
The number of roots of equations z15 = 1 and Iarg zI< π/2 is