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find the minimum value of cos²Ф + sec²Ф

plss answer fast its very urget
Wait let me try first
U know the values of it
I mean value of sec 30 degree
2/root 3


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By AM-GM inequality we have

Thus the minimum value is \boxed{2} and this is achieved when \Phi=n\pin\in\mathbb{Z}
3 5 3
thnk u soo much :)
yw:) ahh just noticed a typo, that > should be >=
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