CBSE Class 11-science Answered
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Asked by | 17 Sep, 2008, 07:19: PM
Expert Answer
cot2A - tan2A = cos4A -sin4A / cos2A sin2A
multiply numerator and denominator by 4
4cos2A sin2A = sin22A
cos4A -sin4A = (cos2A - sin2A)(cos2A +sin2A) = cos2A
cot2A - tan2A = cos4A -sin4A / cos2A sin2A = 4cos2A / sin22A = 4cot2Acosec2A
Answered by | 18 Sep, 2008, 01:07: PM
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