how to use degree in sin function

• Subject: how to use degree in sin function
• From: Alexey Beshenov
• Date: Sun, 18 Jan 2009 19:17:30 +0300

On Sunday 18 January 2009 19:00:19 ? ?? wrote:
> (%i9) sin(%pi/6);
> (%o9) 1/2
> (%i10) sin(30);
> (%o10) sin(30)
>
> we have 30 degree =%pi/6 radian
> the sin function is use radian.
> how can I use degree in sin funciton
> for example
> I want input sin(30) =1/2
> I wish the students can free input degree and they can get the sin
> function answer.

deg_to_rad (x) := x*%pi/180$
sin_deg (x) := sin(deg_to_rad(x))$
sin_deg (30) => 1/2

-- 
Pungenday, Chaos 18 YOLD 3175
Alexey Beshenov  http://beshenov.ru/

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