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If sin^-1 (x/5) + cosec^-1 (5/4) = π/2, then the value of x is ….. (a) 4 (b) 5 (c) 2 (d) 3

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If sin-1 (x/5) + cosec-1 (5/4) = π/2, then the value of x is …..

(a) 4

(b) 5 

(c) 2 

(d) 3

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Best answer

(d) 3

25 - x2 = 16

x2 = 9 

x = 3

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