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Question

If secθ=min(ax+1ax), where a>0,xR, then the value of θ

A
120
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B
30
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C
60
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D
150
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Solution

The correct option is C 60
secθ=min(ax+1ax)

We know that,
ax+1ax2 when a>0
min(ax+1ax)=2secθ=2θ=60

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