Trigonometric Functions: 

double sin(double x); long double sinl(long double x); The sin() function calculates the sine of a number. Consider AB the length of A to B, also called the hypotenuse to point A. Also consider CB the length of C to B, which is the opposite side to point A. The sine represents the ratio of CB/AB; that is, the ratio of the opposite side, CB over the hypotenuse AB. The sin() function takes a doubleprecision number and returns one between –1 and 1. The sinl() function is used for 10byte values. 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 sine and displays the result in the same Edit control: // void __fastcall TForm1::edtValueKeyPress(TObject *Sender, char &Key) { if( Key == VK_RETURN ) { double Value = edtValue>Text.ToDouble(); double Sinus = sin(Value); edtValue>Text = Sinus; } } //

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