d/dx[sin(x) + cos(x)]

cos(x) - sin(x)

CM

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A particle P of mass 2 kg is held at rest in equilibrium on a rough plan. The plane is inclined to the horizontal at an angle of 20°. Find the coefficient of friction between P and the plane.


Prove or disprove the following statement: ‘No cube of an integer has 2 as its units digit.’


a typical question would be a setof parametric equations y(t) and x(t), asking you to find dy/dx and then the tangent/normal to the curve at a certain point (ie t = 2)


How can I calculate the standard deviation of a data set?