Question

please anyone answer this question​

Answer 1

Step-by-step explanation:

x^2+1/x^2=(x+1/x)^2-2

x=cos@+isin@

1/x =1/cos@+isin@=cos@-isin@/cos^2@+sin^2@

=cos@-isin@

x^2+1/x^2=(cos@+isin@+cos@-isin@)^2-2

=4cos^2@-2=2(2cos^2@-1)

=2cos2@