Subject
পেট্রোবাংলা
Topic
সিলেট গ্যাস ফিল্ড লিমিটেড (সহকারী ব্যবস্থাপক) - ০১.১০.২০২১
(লিখিত প্রশ্ন) If f(x,y) = (x² - 2xy + y²)/(x² - y²) then f(-x,-y) = ?
(লিখিত প্রশ্ন) If f(x,y) = (x² - 2xy + y²)/(x² - y²) then f(-x,-y) = ?
ক)
(x - y)/(x + y)খ)
(x - y)/xগ)
(x + y)/(x + y)ঘ)
কোনটিই নয়Explanation
দেওয়া আছে, f(x,y) = (x² - 2xy + y²)/(x² - y²) ⇒ f(-x, -y) = {(-x)² - 2(-x)(-y) + (-y)²}/{(-x)² - (-y)²} ⇒ f(-x, -y) = (x² - 2xy + y²)/(x² - y²) = (x - y)²/(x² - y²) = {(x - y) (x - y)}/{(x - y)(x + y)} = (x - y)/(x + y)Related questions
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