If #x+1/x=-1# then What is the value of #x^247+1/x^187=#?
As already obtained in the first answer,
r = 1.
For the first root, cosine is negative and sine is positive.
the second quadrant and is
For the second, both are negative.
So, it is
=2 cos (even
Both are the same -1...
In the equation
Substituting we have
so the equation reduces to
Putting all together
For lower class student I do it as follows
Will this do?