Subject

    গাণিতিক যুক্তি

    Topic

    সূচক ও লগারিদম

    (xb/xc)(b + c - a). ( xc/ xa)(c + a - b). (xa/ xb)(a + b - c)= ?

    ক)
    xabc
    খ)
    1
    গ)
    xab + bc + ca
    ঘ)
    xa + b + c

    Explanation

    x (b - c)(b + c - a) .  x (c - a)(c + a - b) .  x (a - b)(a + b - c) = x (b - c)(b + c) - a(b - c) .  x (c - a)(c + a) - b(c - a) .  x (a - b)(a + b) - c(a - b) = x (b^2 - c^2 + c^2 - a^2 + a^2 - b^2) .  x -a(b - c) - b(c - a) - c(a – b) = (x 0 . x 0 ) = (1 x 1) = 1

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