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Parties are unable to organise government to deliver a political programme –Decreasingly valid, as party control in Congress has strengthenedPressure groups have taken over the role of parties in financin...

We can set arctan(x) = y. Remember that arctan(x) is the inverse of tan(x), so we can take the tangent of both sides to give: tan(arctan(x)) = x = tan(y). Tan(x) has the standard derivative of sec^2(x) (w...

Diagram should include two orthogonal lines, representing the wall and floor. Connecting them should be a diaganol line (the ladder)
At the midpoint of the line should be a vertical downward...