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Q.

A quadratic equation whose roots are tan22 102 and  cot 22102 is

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a

x2+22 x - 1 = 0

b

2x222 x + 1 = 0

c

x222 x + 1 = 0

d

x222 x - 1 = 0

answer is A.

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Detailed Solution

α=tan22102=2-1 β=cot22102=2+1 α+β=2,  αβ=1 req. eqb. is  x2-(α+β)x+αβ=0 x2-22 x+1=0

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