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Global Maxima

If M and m ar...

Question

If M and m are maximum and minimum value of the function $f (x) = \frac{{tan}^{2} x + 4 tan x + 9}{1 + {tan}^{2} x}$ , then $(M + m)$ equals ?

A

20

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B

14

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C

10

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D

8

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Solution

The correct option is C $10$
M + m is 10

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