Verify the identity.
cos 4u= cos^2(2u)- sin^2 (2u)

Verify the identity.
cos 4u= cos^2(2u)- sin^2 (2u)

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Put 'u' as any angle ... let it be \(\large{\frac{\pi}{2}}\) .

What do you get now as : \(\large{\cos(4(\frac{\pi}{2}))}\) = ?

Can you tell me @mitchelsewbaran

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