what is the difference between cos(8) and cosd(8)

I write an equation related to using cosine, sine, tangent but everytime I run mathlab show me a negative result but when I use calculator it is a positive and giving me correct number. so after a little bit digging and I find that it has something to do with cos, sin, tan, cosd, sind, tand what the difference having d or withouth d?

cos(8)

cosd(8)

sin(20)

sind(20)

tan(30)

tand(30)

Answer 1

[Voss]

With the d, the input angle is interpreted as being in degrees. Without the d, it's in radians.

Example, these two commands will produce the same output:

cos(pi/4) % pi/4 radians = 45 degrees

ans = 0.7071

cosd(45)

ans = 0.7071

[Stark Volt]

Thank you, that's help

[necdet batuhan]

Thanks