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If-f-x-cos-2-x-sec-2-x-its-value-always-is-




Question Number 99625 by Kalam last updated on 22/Jun/20
If  f(x)=cos^2 x + sec^2 x, its value  always is
Iff(x)=cos2x+sec2x,itsvaluealwaysis
Answered by maths mind last updated on 22/Jun/20
cos^2 (x)+(1/(cos^2 (x)))≥2  value ∈[2,+∞[
cos2(x)+1cos2(x)2value[2,+[

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