New guy and programming problem

09022018, 06:14 PM
(This post was last modified: 09022018 06:40 PM by Albert Chan.)
Post: #34




RE: New guy and programming problem
Third way to calculate accurate 1  sin(x), is to remove sine function, replaced with cosine.
We can then pick whatever double angle formula is suitable: cos(2x) = cos(x)²  sin(x)² = 2 cos(x)²  1 = 1  2 sin(x)² 1  sin(89.9995°) = 1  cos(0.0005°) = 1  (1  2 sin(0.00025°)²) = 2 sin(0.00025°)² = 3.807717747e11 Note: above same as Klemm differencetoproduct formula (post 27), but probably easier to remember. BTW, you can build multiple angles cosine formula with cosines ... Neat cos(n x) = 2 cos(x) cos((n1) x)  cos((n2) x) 

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