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Prove that f(x)="log""cos"x is strictly ...

Prove that `f(x)="log""cos"x` is strictly decreasing on `(0,pi/(2))` and strictly increasing on `(pi/(2),pi)`

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The correct Answer is:
`x+14y-254=0;x+14y+86=0`
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BETTER CHOICE PUBLICATION-APPLICATIONS OF DERIVATIVES-PREVIOUS YEAR BOARD.S QUESTIONS FOR PRACTICE
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  3. Prove that f(x)="log""cos"x is strictly decreasing on (0,pi/(2)) and s...

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