Question:যদি `4x^2 - 2x = -1` হয়, তাহলে ক. `2x + 1/(2x)` এর মান নির্ণয় কর। খ. `x^2 + 1/(16x^2)` এর মান নির্ণয় কর। গ. দেখাও যে, `16 (x^4 + 1/(256x^4)) = -1` 

Answer ক. দেওয়া আছে, `4x^2 - 2x = - 1` বা, `4x^2 + 1 = 2x` বা, `(4x^2 + 1)/(2x) = 1` বা, `(4x^2)/(2x) + 1/(2x) = 1` `:. 2x + 1/(2x) = 1` খ.`x^2 + 1/(16x^2) = 1/4. 4(x^2) + 1/(16x^2)` `= 1/4 (4x^2 + 1/(4x^2))` ` = 1/4 {(2x)^2 + (1/(2x))^2}` `= 1/4 {(2x + 1/(2x))^2 - 2.2x. 1/(2x)}` `= 1/4 (1^2 - 2)` [’ক’ হতে] `= (-1)/4` গ.`16(x^4 + 1/(256x^4))` `= 16{(x^2)^2 + (1/(16x^2))^2}` `= 16 {(x^2 + 1/(16x^2))^2 - 2.x^2. 1/(16x^2)}` `= 16{(- 1/4)^2 - 1/8}` [’খ’ হতে] `= 16 (1/(16) - 1/8)` `= 16 ((1 - 2)/(16))` `= - 1` 

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jodi `4x^2 - 2x = -1` hoyo, tahole ka. `2x + 1/(2x)` ar man nirony karo. kh. `x^2 + 1/(16x^2)` ar man nirony karo. ga. dekhao je, `16 (x^4 + 1/(256x^4)) = -1`
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