2017年2月7日 · A calculator must be used. To put your calculator in degree mode, press the MODE button and select degree, the press the 2nd button then MODE again. For most TI calculators, press the 2nd button then press the cos button then enter the value 0.34. This will give you an answer of 70.123 (when you round to 3 decimal places). (see answer)

2016年12月26日 · Calculate cos^-1 (-0.8) in both Radians and Degrees by changing modes in your calculator and repeating the calculation. Change modes by pressing "setup" on the calculator, then press "angle unit" and change to your desired mode.

2018年6月2日 · First i would get the degree by doing cos−1(0.24) in a calculator to get 76.113 ∘ This is 76.133 out of 360 which is 76.133 360 Radians is out of τ or 2π To find out radian multiply the fraction by τ or 2π to get: 76.133 360 ⋅ 2π = 152.266π 360 = 76133π 180000

2018年7月15日 · The question can be read as .. "What angle has a cos value of 0.8217?" If you just need an angle in a right-angled triangle, then on a scientific calculator you would key in: shift/alt/ 2ndF cos−10.8217 = to get an angle of 34.7° However, if you want to include angles from 0° → 360° then we need to consider the sign and decide which quadrants we are working in. Cos is positive in the ...

2018年4月13日 · Cosine is an even function, meaning cos(−x) = cosx. So, cos(− π 2) = cos(π 2) = 0 Then, we really want cos−1(0) = x → cos(x) = 0 → x = π 2 as the domain of the inverse cosine is [− 1,1].

2016年9月3日 · You key it in exactly as it is written. Use the shift/alt/2nd F key before the cos key, to use cos−1 This is not the same as 1 cos cos−1 is the way of finding which angle has a cos value of −0.3218 cos−1(− 0.3218) = 108.77° or cos−1(−0.3218) = 251.23°

2017年6月14日 · cos x = - 0.44. Calculator and unit circle give --> x = ± 116∘ +k360∘

2018年1月12日 · Since Z>0 we know that Z could come from QI or QIV. We'll find hatZ, the reference angle for Z: cos (Z)=0.98 rarr hatZ=cos^ (-1) (0.98) For the QI angle, we have Z = cos^ (-1) (0.98) + 2pi*n, n in ZZ.

2016年11月24日 · How do you calculate cos−1(cos(− 0.5))?-0.5 Let Cos^-1 [Cos (-0.5)]=A Cos A=Cos (-0.5) A= -0.5

2015年8月12日 · x = 2npi for AAn in ZZ cos (2x) = 2cos^2 (x)-1color (white) ("XXXX") (This is one version of the double angle formula for cos) So color (white) ("XXXX")cos (2x)+cos ...