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why trigonometry input in degrees gives wrong results

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Madhu
Madhu 2014-7-12
编辑： Azzi Abdelmalek 2014-7-12
Hello, Here is a simple trigonometry functions where i have given data in degrees and radians, why i am getting a wrong result when i am giving in degrees.
>> a=30 a =
30
>> b=pi/6
b =
0.5236
>> c=sin(a)
c =
-0.9880
>> d=sin(b)
d =
0.5000

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2014-7-12
编辑：Azzi Abdelmalek 2014-7-12
If a is in degree you need to use another function
sind(3)
Also, when you say a is in degree, you know this, but how the function sin knows if it's degree or rad? the function sin consider a in radian.

更多回答（1 个）

Image Analyst
Image Analyst 2014-7-12
Use the "d" versions of the trig functions when you want to input in degrees:
sind(30) % Uses sind() rather than sin().
sin(pi/6)
ans = 0.5
ans = 0.5

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