what is cos 30?

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goshi aslam
goshi aslam 2015-2-21
回答： Greig 2015-2-21
cos*30

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回答（2 个）

Greig
Greig 2015-2-21
MATLAB also has the cosd() function, so you can use cosd(30). Have a look at the trigonometry documentation for other similar function.
SamBro
SamBro 2015-2-21
MatLab will do all calculations in radians as a default. So if you want to calculate
ans=cos(30);
in degrees you'll need to write:
ans=cos(30*pi/180);
ans=sqrt(3)/2
Otherwise, if you calculate
ans=cos(30);
in MatLab you'll get:
ans=0.1543

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