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Using identity, evaluate 10 5 * 9 5

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Hii experts pls do the following sum with identity i have chosen @i e " a^2 -b^2 =(a+b)(a-b) i posted it before als

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Hii experts I solved the underlined equation but getting a wrong ans ,ans shoud be'-3/2' rather than '3/2

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Kindly ans the below question

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4 find the answer (a+1/a)(a-1/a)

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3 find the answer (4p+5t)(4p-5t)(16P2+25T2)

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11 97*103 12 395*395-205*205/600 13 (x2+y2) if xy=15 x-y=6 14 (X2+Y2) if x+y=10 xy=15 15 (x2+y2) if xy=10 and (x+y)=6

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6 (9/y2-y2/9)2 7 (1/4x2+16)(1/4x2+16) 8 (502)2 9 (199)2 10 262*262-105*105/157

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FIND THE ANSWER (2x+1)(2x-1)(4x2+1) 2 (Z+1)(Z-1)(Z2+1) 3 (4p+5t)(4p-5t)(16P2+25T2) 4 (a+1/a)(a-1/a) 5 (1/6P2-2/7T2)2

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What is the formula of (a+b)^2