Prove that:-cos2A=cos^2A--sin^2A

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Prove Cos2A=Cos^2A-Sin^2A 0:03:13

Prove Cos2A=Cos^2A-Sin^2A

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Prove that (1)`sin2A=2sinAcosA` (2)`cos2A=cos^2A-sin^2A`

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12. A=45, verify that (i) sin2A=2sinAcosA (ii) cos2A=2cos²A-1=1-2sin²A