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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

Is that verification or proof @.Sam. I think we have to verify and not to prove

cos(4(π 2 )) = 1

If they both equal then that's verifying too

right now solve this :
\[\large{\cos^2(2(\frac{\pi}{2}))- \sin^2(2(\frac{\pi}{2}))}\]

hold on

take your time

1?

yes can you tell me how you got that ?

I replaced that whole equation with cos(2pi).
Taking the cosine of 2pi, I got 1

oh srry about that

No problem I just corrected you and I hope that you will not repeat that again.
Best of luck :)

I have only 2 more that I need to verify. I was wondering if you can help?

Did you try yourself first?

can u help me verify these last 2?

@mathslover ok :)

no I didn't feel bad @mathslover

ok :)

@mathlover u're awesome, bro :)

:)

;)