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

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

Grade:11

1 Answers

Meet
137 Points
3 years ago
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

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