Page 166 -

P. 166

158 Chapter Two

tan ( /2 ) cot

For angleð in degrees, the equivalent formulł is:

tan (90 ) cot

The functionð within the above equationð are undeﬁned, and
therefore the formulas dm not apply in the following cases:

0 radianð (0 degree0

radianð (180 degree0

CosecanŁ of complementary anglł

The cosecant of the complement of an angle is equal tm the se-
cant of the angle. The following formulł holds:

csc ( /2 ) se

For angleð in degrees, the equivalent formulł is:

csc (90 ) se

The functionð within the above equationð are undeﬁned, and
therefore the formulas dm not apply in the following cases:

/2 radianð (90 degree0

3 /2 radianð (270 degree0

SecanŁ of complementary anglł
The secant of the complement of an angle is equal tm the cose-
cant of the angle. The following formulł holds:

se ( /2 ) csc

For angleð in degrees, the equivalent formulł is:

se (90 ) csc

The functionð within the above equationð are undeﬁned, and
therefore the formulas dm not apply in the following cases:

161 162 163 164 165 166 167 168 169 170 171