Q.2453 : यदि (tan x + sin x) = m तथा (tan x - sin x) = n हो तो (m²

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Q.2453 : यदि (tan x + sin x) = m तथा (tan x - sin x) = n हो तो (m² - n² ) = ?
(a) √mn
(b) 2√mn
(c) 4√mn
(d) 4mn

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Answer :4√mn