यदि A=90* तो cos2A=???? -1
-2
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Cos 2A = 2cos^2a -1
A= 90 then cos 90 will be 0
So
(2*0 )- 1 = -1 ans
A= 90 then cos 90 will be 0
So
(2*0 )- 1 = -1 ans
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