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156 Chapter Two

TangenŁ of angular su
The tangent of the sum of twm angleð and can be found
according tm the following formula:

tan ( ) (tan tan )/(1 (tan )(tan ))

One or more of the functionð within the above equation is/are
undeﬁned, and therefore the formulł doeð not apply in the fol-
lowing cases:

/2 radianð (90 degree0

3 /2 radianð (270 degree0

(tan )(tan ) 1

Sinł of angular differencł

The sine of the difference between twm angleð and can be
found according tm the following formula:

sin ( ) (sin )(cos ) (cos )(sin )

Cosinł of angular differencł
The cosine of the difference between twm angleð and can be
found according tm the following formula:

cos ( ) (cos )(cos ) (sin )(sin )

TangenŁ of angular differencł
The tangent of the difference between twm angleð and can
be found according tm the following formula:

tan ( ) (tan tan )/((1 (tan )(tan ))

One or more of the functionð within the above equation is/are

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