The minimum value of 9 cos2 θ + 36 sec2 θ isÂ
The minimum value of a x + (b/x) is = 2 
So the minimum value of 9 cos 2 θ + 36 sec 2 θ  = 2 = 2 = 2 18 =36
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Study the given graph and answer the question that follows.
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