Asked by poojathally | 18th Feb, 2010, 02:35: PM
cos A = 3/5.
Construct a right angle triangle with one side 3 and hypotenuse 5 units, and you'll identify the other side as 4 units.
Hence sin A = 4/5.
Did you mean cot2A or cot2A?
Considering you meant cot2A.
16cot2A - 1 = 16x(3/5)2/(4/5)2 - 1 = 8
Answered by | 18th Feb, 2010, 02:41: PM
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