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shefali sharma Grade: 12
        

number of real solutions of equation


(1+ cos2x)1/2 = 21/2 sin inverse sinx   ,-Π <= x <= Π is


 


 


ans: 2

7 years ago

Answers : (1)

Priyansh Goel
21 Points
										

See


1+cos2x= 2cos2x;


using this and putting it in given expression I will get cosx = sin-1sinx.   ,-Π <= x <= Π


Now  draw the curves of cosx  for  -Π <= x <= Π  and also draw the curve of sin-1sinx for -Π <= x <= Π and find the no. of intersection points of the curve. They will intersect at two points only. So, Ans is 2.

7 years ago
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