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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采纳的回答
Paulo Silva
2011-5-29
Those functions work in radians not degrees, try this
cosd(45)
sind(45)
3 个评论
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 ?
更多回答(5 个)
bym
2011-5-29
sin() & cos() arguments are in radians. If you want degrees use
sind() cosd()
3 个评论
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.
krishna sutradhar
2021-6-23
编辑:Walter Roberson
2021-12-18
sin(2250 ) + cot(300 ) + tan-1 (1/2) + 10e-10 + 9x10-2 + (log1010)3 + (loge10)5
2 个评论
Walter Roberson
2021-12-18
sind(2250) + cotd(300) + atand(1/2) + 10e-10 + 9*10^-2 + log10(10)^3 + log(10)^5
Nishith Sarkar
2022-6-29
编辑:Nishith Sarkar
2022-6-29
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
2022-2-14
Cos(45)
1 个评论
Walter Roberson
2022-2-14
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
2022-6-29
编辑:Nishith Sarkar
2022-6-29
Answer please::
x=3cos50π+10sin300π-cos100π
2 个评论
Walter Roberson
2022-6-29
编辑:Walter Roberson
2022-6-29
Pi = sym(pi);
x = 3*cos(50*Pi) + 10*sin(300*Pi) - cos(100*Pi)
Steven Lord
2022-6-29
另请参阅
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