নিচের কোনটি সঠিক -

i. sin-1 x + cos-1 x  = π2

ii. tan-1 x + cot-1 x  = π

iii. sec-1 x + cosec-1 x  = π2

নিচের কোনটি সঠিক?

Created: 1 year ago | Updated: 1 year ago
Updated: 1 year ago
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