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Grade: 11
        
If cos2x+2cosx=1 then sin^2x (2-cos^2x)=
a. 1
b.-1
C.-root 5
D. Root 5
 
2 years ago

Answers : (1)

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137 Points
							Answer is a) 1,  firstly convert cos2x into cosx  and given equation is as follows cos^2x + cosx = 1, nowfor finding value of the equation  convert sin into cos and it is like this   (1-cos^2 x) (2-cos^2 x) and further put the value of cos^2 x from the equation and after putting value it will came out as (cosx) (1+cosx) and its value is 1
						
2 years ago
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