Double Angles The formulae for double angles follow from those for compound angles. Sine Using: [1.1, repeated] And setting β to α, we have: sin(2·α)=sinα·cosα+sinα·cosα= by [2.1] Cosine As with sine, setting β to α in the following: [1.3, repeated] We have: cos2α=cosα·cosα-sinα·sinα= cos 2 α−sin 2 α= 2·cos 2 α−1 ... Example: A form contains an Edit control named edtValue. After the user has typed a value and presses Enter, the OnKeyPress event retrieves the number typed in the edit box, calculates its cosine and displays it in the same Edit control:

Bearing Angle Calculator Online You will not be asked for values of trigonometric functions that require a calculator. Remember, the complementary angle relationship for sine and cosine, which is $\sin(x°)=\cos(90°−x°)$ will be $\sin(x)=\cos({π}/{2}−x)$ when converted into radians.

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