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[" 12.If "A=45^(@)" ,verify that: "],[qq...

[" 12.If "A=45^(@)" ,verify that: "],[qquad " (i) "sin2A=2sin A cos A]

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If A= 45^(@) , verify that: (i) sin 2A=2 sin A cos A (ii) cos 2A= cos^(2)A-"sin"^(2)A .

If A= 45^@ , verify that : sin 2A =2 sin A cos A .

If A=45^(@) , verify that (i) sin2A=2sinAcosA (ii) cos2A=2cos^(2)A-1=1-2sin^(2)A

If A =30^(@) ,verify that cos2A =cos^(2)A-sin^(2)A .

If A =30^(@) ,verify that cos2A =cos^(2)A-sin^(2)A .

If A= 45^@ , verify that : cos 2A = cos^2 A - sin^2 A.

2sin45cos45

Verify that : sin 60^@ = 2 sin 30^@ cos 30^@

If A= 30^@ verify that :- cos2A=1- 2sin^2A .

if A=45^(@) then verify sin2A=2sin AcosAcos2A=1-sin^(2)A