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