The addition formulae and trigonometric identities are used to simplify or evaluate trigonometric expressions. Trigonometric equations are solved using a double angle formulae and the wave function.

Solve trigonometric equations in Higher Maths using the double angle formulae, wave function, addition formulae and trig identities.

Summation Formula: A closed-form expression used to compute the sum of sequences, particularly those involving trigonometric functions, without recourse to term-by-term addition.

Double angle formulas are named so because they involve trigonometric functions of double angles, i.e., sin2θ, cos2θ and tan2θ. There are three main double angle formulas as below: ...

I developed this scientific calculator using HTML, CSS, and JavaScript. This calculator supports a wide range of mathematical functions, from basic arithmetic operations (addition, subtraction, ...