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secx=2/sqrt(2+(sqrt(2+2cos4x)))...

`secx=2/sqrt(2+(sqrt(2+2cos4x)))`

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sqrt(2+sqrt(2+2cos4 theta))

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Smallest form of 2/(sqrt(2+sqrt(2+sqrt(2+2 cos4x)))) is :

secx = - sqrt(2) .

(2)/(sqrt(2) + sqrt(2) + sqrt(2+2 cos 4x)) equals