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4371.Two non-coplanar straight lines neither intersect nor they are parallel. Such straight lines are called?
4372.Maclaurin’s series expansion of cosx is ______?
4373.Samad purchased 20 dozens of toys at the rate of Rs. 375 per dozen. He sold each one of them at the rate of Rs. 33. What was his percentage profit?
4374.The standard deviation of 10, 10, 10, 10 is ____?
4375.The set of points (x,y) such that: a - δ ≤ x ≤ a + δ, b − δ ≤ y ≤ b + δ determines?
4376.If y = x²/1+x², ∫ y dx = C + f, f = ______?
4377.Derivative of 2^-x with respect to x, is ______?
4378.∂f/∂x = lim(h → 0) [f(x + h, y) - f(x, y)]/h, if exists, is called the partial derivative of f with respect to _____?