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[" 2.If "A=45^(@)" show that: "],[[" (a)...

[" 2.If "A=45^(@)" show that: "],[[" (a) "cos2A=1-2sin^(2)A=2cos^(2)A-1]]

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If A =45^(@) ,then show that : cos 2A=cos^(2)A-sin^(2)A

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