Q.

A quadratic equation whose roots are cosec2θ and sec2θ can be

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a

x2−2x+2=0

b

x2−3x+3=0

c

x2−x+1=0

d

None of these

answer is D.

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Detailed Solution

Sum of roots=sec2θ+cosec2θ=1cos2θ+1sin2θ                                                                                             = 4sin22θ≥4Also, product of roots=sec2θcosec2θ=4sin22θ≥4∴The required quadratic equation will be x2−tx+t=0 where t≥4.
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