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The minimum value of atan^2x+bcot^2x equ...

The minimum value of a`tan^2x+bcot^2x` equals the maximum value of a`sin^2theta+bcos^2theta` where `agtbgt0,` then a equals to

A

a)a = b

B

b)a = 2b

C

c)a = 3b

D

d)a = 4b

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The correct Answer is:
D
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