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Grade: 12


Let f : (0 , pie) is defined to R by f(x) = max { sin2x, cos2x}. then show that the set of points of which f(x) has a local maxiam or minima is equlas to { pie/8 , pie/4 , 5 pie/8 } .

11 years ago

Answers : (2)

Ramesh V
70 Points

From the figure , the curve f(x) is shown in black bold line

the local minima is at : Pi/8 , 5Pi/8

and local maxima at : Pi/4


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Naga Ramesh
IIT Kgp - 2005 batch

11 years ago
16 Points

period of cos2x,sin2x is pie

we will redefine the function given

now in(0,pie/8) cos2x.>sin2x , in (pie/8 to 5pie/8) sin2x>cos2x and in ( 5pie/8 to pie)again cos2x>sin2x (by comparing graph)

sof(x) = cos2x.  (0,pie/8)

               sin2x    (pie/8 to 5pie/8)

               cos2x   ( 5pie/8 to pie)

        now u can get it by drawing the graph

note : pie is not the answer because pie is the last point of the fonction so it is the global maxima not the local maxima.

11 years ago
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