0.766
Wiki User
∙ 13y agoThis 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'.
A Quadrantal angle is an angle that is not in Quadrant I. Consider angle 120. You want to find cos(120) . 120 lies in quadrant II. Also, 120=180-60. So, it is enough to find cos(60) and put the proper sign. cos(60)=1/2. Cosine is negative in quadrant II, Therefore, cos(120) = -1/2.
Sorry, but cos(50)sin(40) - cos(40)sin(50) is -0.1736, which is not even close to sin(90) which is 1.This does not work in radians, either. Please restate your question.
Cos is the ratio between adjacent side (of the given angle thieta) to the hypotenuse of the triangle.
A 40 degree angle is the COMPLEMENT of a 50 degree angle.
Any polygon can have a 40-degree angle. It doesn't have to, but it can.
In degree mode. cos(40) = 0.7660444431 degrees ( 77 degrees will do ) In radians. cos(40) = - 0.6669380617 radians
cos(50) = 0.6428 (rounded)
A 40 degree acute angle can be constructed with a straight edge and a protractor.
Fifty degrees. 90+40+90=180
A 40 degree angle is an acute angle, since all angles less than 90 are acute.
cos 45o = 1/√2 = 1/2 x √2 ≈ 0.707
It is an acute angle.
140o
Cos(65 deg) = 0.4226 approx.
40 cos 60+80+x=180 so 180-140 will give us 40 remember x is the value of the third degree