i need to prove that for every $\displaystyle y\geq x\geq\frac{3}{\pi} $ :$\displaystyle y^{2}cos\frac{1}{y}-x^{2}cos\frac{1}{x}\geq(y^{2}-x^{2})cos\frac{1}{x}\geq\frac{(y^{2}-x^{2})}{2}$

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- Apr 13th 2013, 10:15 AMorirtrigonometric inequation
i need to prove that for every $\displaystyle y\geq x\geq\frac{3}{\pi} $ :$\displaystyle y^{2}cos\frac{1}{y}-x^{2}cos\frac{1}{x}\geq(y^{2}-x^{2})cos\frac{1}{x}\geq\frac{(y^{2}-x^{2})}{2}$

- Apr 13th 2013, 06:17 PMtopsquarkRe: trigonometric inequation
- Apr 16th 2013, 12:29 AMmianasad1125Re: trigonometric inequation
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