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Avnish Pal Singh

· started a discussion

· 1 Months ago

please explain!!!! (Question: 269924.0 )

i did not get the last step

Question:

Find the minimum value of: 12 sec2  θ    + 3 cosec2  θ    = ?

Options:
A)

35

B)

27

C)

25

D)

29

Solution:

Ans: (b)

  

latesh ukarde

· commented

· 1 Months ago

(root12+root3)^2=27

Knowledge Expert

· commented

· 1 Months ago

Dear student,

Here using short trick to find minimum value-
If given function-
a tan^2 thita+b cot^2 thita
or
a sin^2 thita+b cosec^2 thita
or
a cos ^2 thita+b sec^2 thita

Minimum value= 2 root ab

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