Sine

The sine function works on only one value that is specified in radians.

Syntax: $UF=sin(UF_1)$

Explanatory notes: Since the sine function (or cosine) in conjunction with the Fourier transformation is common in image processing, the sine function is expected to enrich the Fib multimedia description language. The cosine function can be easily obtained from the sine function (by the addition of $\pi/2$: $cos{(x)}=sin{(x+\pi/2)}$). The tangent function can be derived using the sine function
( $\tan{(x)}=sin{(x)}/sin{(x+\pi/2)}$).

Examples:

• $fun(x, sin(0), Obj)$; realizes the function: $x=\sin{0}=0$
• $fun(x, sin(1.57), Obj)$; realizes the function: $x=\sin{1.57}=\sin{3.14/2} \simeq 1$
• $fun(x, sin(y), Obj)$; realizes the function: $x=\sin{y}$
• $fun(x, sin( sub( 1.57, y ) ), Obj)$; realizes the function: $x=\sin{(1.57 - y)} \simeq \cos{y}$