CUET Preparation Today
If x is a real quantity, what is the minimum value of $\left(25 \cos ^2 x+9 \sec ^2 x\right)$ |
30 20 15 40 |
30 |
Concept we are using here is :- If we are given acos²x + bsec²x , then Minimum value of acos²x + bsec²x is 2\(\sqrt {ab }\). ATQ, Minimum value of 25cos²x + 9sec²x = 2\(\sqrt {25 ×9 }\) = 30
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