X.

sin a + sin (a + B) + sin (a + 2ß) + ... to n terms

cos a + cos (a + ß) + cos (a + 2ß) + ... to n terms

1

1

2

log. (1 + x) = x − x2 + 1} æo − x + ..... ad inf.

3

4

XV. Log (a + Bi)

Log (a + Bi) = log. √a2 + ẞ2 + i (2nπ + 0),

ß2

PART I.

GEOMETRICAL TRIGONOMETRY.