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??
0 Comments
Accepted Answer
Paulo Silva
on 29 May 2011
Those functions work in radians not degrees, try this
cosd(45)
sind(45)
3 Comments
Walter Roberson
on 18 Dec 2021
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 ?
More Answers (5)
bym
on 29 May 2011
sin() & cos() arguments are in radians. If you want degrees use
sind() cosd()
3 Comments
Steven Lord
on 20 Apr 2020
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.
krishna sutradhar
on 23 Jun 2021
Edited: Walter Roberson
on 18 Dec 2021
sin(2250 ) + cot(300 ) + tan-1 (1/2) + 10e-10 + 9x10-2 + (log1010)3 + (loge10)5
2 Comments
Walter Roberson
on 18 Dec 2021
sind(2250) + cotd(300) + atand(1/2) + 10e-10 + 9*10^-2 + log10(10)^3 + log(10)^5
Nishith Sarkar
on 29 Jun 2022
Edited: Nishith Sarkar
on 29 Jun 2022
Question: sin(225) + cot(30) + tan-1(1/2) + 10e-10 + 9x10-2 + (log1010)3 + (loge10)5
>> ns1=sind(225)
ns1 =
-0.7071
>> ns2=cotd(30)
ns2 =
1.7321
>> ns3=atand(1/2)
ns3 =
26.5651
>> ns4=10e-10
ns4 =
1.0000e-09
>> ns5=9*10^-2
ns5 =
0.0900
>> ns6=log10(10)^3
ns6 =
1
>> ns7=log(10)^5
ns7 =
64.7260
>> Nishith=ns1+ns2+ns3+ns4+ns5+ns6+ns7
Nishith =
93.4059
Adedotun Taiwo
on 14 Feb 2022
Cos(45)
1 Comment
Walter Roberson
on 14 Feb 2022
MATLAB is case sensitive. That would not work.
Cos(45)
Paulo correctly answered a decade ago that if you are using degrees, use sind() and cosd()
Nishith Sarkar
on 29 Jun 2022
Edited: Nishith Sarkar
on 29 Jun 2022
Answer please::
x=3cos50π+10sin300π-cos100π
2 Comments
Walter Roberson
on 29 Jun 2022
Edited: Walter Roberson
on 29 Jun 2022
Pi = sym(pi);
x = 3*cos(50*Pi) + 10*sin(300*Pi) - cos(100*Pi)
Steven Lord
on 29 Jun 2022
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