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| Values of Trigonometric Functions of 30o, 45o, 60o and 90o |
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Let OA be the revolving ray starting from A. Let OA take the new
position OP so that  |
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| Draw PM perpendicular to OX and produce it to Q. |
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| Draw OQ. |
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| Let 2l be the length of each side of the triangle. Then |
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| OP = OQ = QP = 2l. PM = MQ= l. |
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| From OMP |
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| Let OM = l = MP |
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| Let PA = PO = 2l |
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| 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). |
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| In the figure, |
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| Here cosec 0o and cot 0o are not defined. |
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| f) cosec 180o and cot 180o are not defined. |
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| g) cosec 360o and cot 360o are not defined. |
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