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Grade: 12th pass
        
if tan^2 x+sec x -a=0 has atleast one solution then complete set of values of a is
6 months ago

Answers : (2)

Anish Singhal
askIITians Faculty
1200 Points
							555-2261_Untitled.png
						
6 months ago
Deepak Kumar Shringi
askIITians Faculty
4397 Points
							put tan2x = sec2x-1 so you get
sec2x-secx-a-1 =0 this equation has roots from either less than -1 or more than 1 so
D >= 0
but now f(1) f(-1) >=0 also necessary otherwise roots will lies between (-1,1) that not possible
here >= means more than equal to
thanks
6 months ago
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