inverse cosine การใช้

• :The distance between ttwo points of the unit sphere is given by the inverse cosine of their dot product.
• The last function is equal to the inverse cosine trigonometric function \ arccos ( x ) in the entire complex domain.
• Algorithms using the other formulas are similar, but each using different tables ( sine, inverse sine, cosine, and inverse cosine ) in different places.
• The angle of apparent wind ( \ beta ) can be calculated from the measured velocity of the boat and wind using the inverse cosine in degrees ( \ arccos)
• The transform converts spatial variations into frequency variations, but it does not change the information in the block; the original block can be recreated exactly by applying the inverse cosine transform.
• Using the second formula, however, has the unique advantage that if only a cosine table is available, it can be used to estimate inverse cosines by searching for the angle with the nearest cosine value.
• The ultimate ratio of yacht speed to wind speed therefore also gives rise to Beta by inverse cosine . e . g . speed-sailing at twice the windspeed corresponds to a 30 degrees apparent wind angle i . e . Beta = 30 degrees.
• Because cosine is an inverse cosine is usually 0 \ leq \ cos ^ {-1 } ( \ theta ) \ leq 1 we take the negative possible value for the \ theta _ s term, thus ensuring that \ theta _ c is positive.
• Then all the values on the opposite side you should know, and so you have the exact value of cosC . Take the inverse cosine of each side and you're there .-" Talk ) 08 : 59, 4 June 2008 ( UTC)
• :: : Edit : you would have to normalize in this case as well, or you could send the end vector to ( \ cos ( \ phi ), \ sin ( \ phi ), 0 ) where \ phi is the angle between the start and end vectors, which is the inverse cosine of their dot product, or 2pi minus that for interpolations longer than 180 degrees.