1.

`If-(pi)/(2)lt0lt(pi)/(2),` then the minimum value of `cos^(3)theta+sec^(3)thets` isA. 1B. 2C. 0D. none of these.

Answer» Correct Answer - B
We know that
`A.M.geG.M.`
`:." "(cos^(3)theta+sec^(3)theta)/(2)gesqrt(cos^(3)thetaxxsec^(3)theta)`
`implies" "cos^(3)theta+sec^(3)thetage2`.
Hence, the minimum value of `cos^(3)theta+sec^(3)theta" is "2.`


Discussion

No Comment Found