I've read somewhere that the sine and cosine functions can be fully described by this theorem: ... There is na r>0 such that: 0<sin(x)<x<tan(x),x∈(0,r),tan(x)= ... ... <看更多>

The mistake is in this line: double bc = (2 * (Math.pow(AB, 2) + Math.pow(AC, 2) - ((AB * AC))) * CosOfAngle);. which should be:. ... <看更多>