Question

please anyone of the genius student of brainly tell me the way of solving this

Answer 1

by using your brain properly

Answer 2

f(-x):d-x/cos^4(-x)-cos^2(-x)+sin^4(-x)

remove parentheses:d-x/cos^4-cos^2(-x)+sin^4(-x)

- dx/cps^4(x)-cos^2(x)+sin^4(x)

=- dx/cos^4(x)-cos^2(x)+sin^4(x)

neiter even nor odd