[গণিত] a + [গণিত] b = x এবং [গণিত] a + [গণিত] b = y হলে, [গণিত]

ক. [গণিত]

খ. [গণিত]

গ. 0

ঘ. [গণিত]

উত্তর: [গণিত]

ব্যাখ্যা: [গণিত] a + [গণিত] b = x বা, [গণিত] 2 a + [গণিত] 2 b + 2 [গণিত] a . [গণিত] b = x 2 [গণিত] (i) [গণিত] a + [গণিত] b = y বা, [গণিত] 2 a + [গণিত] 2 b + 2 [গণিত] a . [গণিত] b = y 2 [গণিত] (ii) (i) নং ও (ii) নং যোগ করে পাই, [গণিত] 2 a + [গণিত] 2 b + 2 [গণিত] a . [গণিত] b + [গণিত] 2 a + [গণিত] 2 b + 2 [গণিত] a . [গণিত] b = x 2 + y 2 বা, 2 + 2 ( [গণিত] a . [গণিত] b + [গণিত] a . [গণিত] b) = x 2 + y 2 বা, 2 + 2 [গণিত] (a - b) = x 2 + y 2 বা, 2 1 + [গণিত] (a - b) = x 2 + y 2 [গণিত]

HSC Higher Math 1st Paper Chapter 7: সংযুক্ত কোনের ত্রিকোনমিতিক অনুপাত MCQ — Prosthuti প্রশ্নব্যাংক