Calculating sin and cos functions
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Hello, i calculated the value of sin(45) in Matlab, the result was sin(45)=0.8509 and for cosin i got cos(45)= 0.5253. From general mathematics we know that sin(45)=cos(45) then why Matlab is giving different results??
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Paulo Silva
2011-5-29
Those functions work in radians not degrees, try this
cosd(45)
sind(45)
3 个评论
Mohsin Shah
2011-5-29
Abdullah Amin
2021-12-18
y=sin(-75) then y variable should carry value
+1 -1 +75 -75
Walter Roberson
2021-12-18
It is not clear to me why sin() of a scalar should result in a vector of length 4 ? Or why those particular values should be output ?
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bym
2011-5-29
sin() & cos() arguments are in radians. If you want degrees use
sind() cosd()
3 个评论
Mohsin Shah
2011-5-29
Muhammed Çelik
2020-4-20
or, you can do like this sin(degree*pi/180)
Steven Lord
2020-4-20
If you're going to convert degrees to radians or vice versa, use the deg2rad or rad2deg functions moved from Mapping Toolbox to MATLAB in release R2015b rather than the "magic number" of pi/180.
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