SOME MATHEMATICAL FORMULA'S

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Read and understand these formula's, the more you practice the better you know!

                                 Cosine rule

COS A = b²+c²-a² 
                   2bc

COS B = a²+c²-b² 
                   2ac

COS C = a²+b²-c² 
                   2ab

                            Quadratic formula

-b±⎷b²-4ac
        2a

Here are some images below concerning Quadratic formula, with Image 1 showing how the formula itself was derived while Images 2 and 3 show some problems solved with Quadratic formula.

               Image 1:

              Image 2:

              Image 3:

                            Trigonometric rules

Sin (A+B) = SinA CosB - CosA SinB
Sin (A-B) = SinA CosB + CosA SinB
Cos (A+B) = CosA CosB - SinA SinB
COS (A-B) = CosA CosB - SinA SinB

                                 Inverse Matrix

Adj A
  /A/

Example:

                               Percentage error

Absolute error × 100
Actual length

                                              Speed

Speed = Displacement
                       Time

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