1.

sec-1 (2/3) + cosec-1 (2/3) = .....(a) -π/2(b) π/2(c) π(d) -π

Answer»

(b) π/2

We know that sec-1 x + cosec-1 x = π/2

sec-1 (2/3) + cosec-1 (2/3) = π/2



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