If sin-1$\left( {{x \over 5}} \right)$ + cosec-1$\left( {{5 \over 4}} \right)$ = ${\pi \over 2}$, then the value of x is :

Question

If sin^-1$\left( {{x \over 5}} \right)$ + cosec^-1$\left( {{5 \over 4}} \right)$ = ${\pi \over 2}$, then the value of x is :

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