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0.766
cos(37 deg) = 0.7986
This can be done on a graphing calculator by making sure you have your calculator in degrees mode, and then tentering the cos(23). You get an answer of 0.9205048535.
cos(30)cos(55)+sin(30)sin(55)=cos(30-55) = cos(-25)=cos(25) Note: cos(a)=cos(-a) for any angle 'a'. cos(a)cos(b)+sin(a)sin(b)=cos(a-b) for any 'a' and 'b'.
Note: When doing trigonometry, it is highly recommeded that you have a scientific calculator at hand. Also, make sure your calculator is in Degree (D or Deg) mode and not Radian (R or Rad). To find the cosine of 70o, press 'cos', then type in 70, then press equals. You should get 0.342 (to the nearest 3 decimal places).
arc cos -0.32 is approx: --------------- | 108.66° | ---------------
cos(-100 degrees)
cos(495) = cos(495-360) = cos(135) = -cos(180-135) = -cos(45) = -sqrt(1/2) or -1/sqrt(2)
0.00124558979569486315
0.766
cos x=.091 x=(cos^-1).091 x=84.779
cos 60
cos 45o = 1/√2 = 1/2 x √2 ≈ 0.707
38.00
89.00
0.4695
cos(37 deg) = 0.7986