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Double angle formulas

Double angle formulas

This page covers the following topics:

The sine double angle formula involves trigonometric functions of double angles, i.e sin2A.

Double angle formula for sine

The cosine double angle formula involves trigonometric functions of double angles, i.e cos2A.

Double angle formula for cosine

The tangent double angle formula involves trigonometric functions of double angles, i.e tan2A.

Double angle formula for tangent

The sum of two trigonometric functions can be expressed as a single trigonometric function in the form Rcos(xΒ±Ξ±) or Rsin(xΒ±Ξ±).

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