2sinx-cos2x=1 then
2(cos^4x-cos^2x)=-1
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Given:
Given that, .
To find:
We should find the value of .
Solution:
Before solving the question, first we need to expand the given expression.
According to the question,
Rearranging the above terms,
We know that, .
Simplifying the terms,
Now, consider the expression
can be written as .
So,
From the above result, .
Substituting the above value in the above expression,
Simplifying the terms,
The above expression cannot be simplified further. Because the values of above expression are not given in the question.
Therefore, the value of .
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