Tan2x Formula Tan2x Formula Sin 2x, Cos 2x, Tan 2x is the trigonometric formulas which are called as double angle formulas because they have double angles in their trigonometric functions Let's understand it by practicing it through solved exampleWe also notice that the trigonometric function on the RHS does not have a \(2\theta\) dependence, therefore we will need to use the double angle formulae to simplify \(\sin2\theta\) and \(\cos2\theta\) on the LHSThis is the halfangle formula for the cosine The sign ± will depend on the quadrant of the halfangle Again, whether we call the argument θ or does not matter Notice that this formula is labeled "2prime";
Section 6 3 Double Angle And Half