Values of Trigonometric Functions

Let OA be the revolving ray starting from A. Let OA take the new position OP so that 

Draw PM perpendicular to OX and produce it to Q.

Draw OQ.

Let 2l be the length of each side of the triangle. Then

OP = OQ = QP = 2l. PM = MQ= l.

From OMP

Let OM = l = MP

Let PA = PO = 2l

Let a unit circle with centre O at x-axis and y-axis at A(1,0), A(-1,0), B(0,1) and B(0,-1).

In the figure,

Here cosec 0^o and cot 0^o are not defined.

Values of trigonometric ratios of 180 (P), 360 (2P)

f) cosec 180^o and cot 180^o are not defined.

g) cosec 360^o and cot 360^o are not defined.