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General

Easy

Question

# If d then the minimum value of is equal to (where is variable)

Hint:

### In the question we will first use the formula cos(A+B)=cosA.cosB-sinA.sinB and cos(A-B)=cosA.cosB+sinA.sinB then we will convert sin and cos in terms of tan using the formula then we will make a quadratic equation assuming x in terms of tan. Then we will use the concept of D is greater than 0 to get the required result.

## The correct answer is:

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