Cnsider the possible identity tan2xcos2x 1 cos2x

Question

Consider the possible identity tan²x(cos²x + 1) + cos²x + sec²x

a) state any non-permissible values

b)attempt to verify the possible identity numerically.

c) Attempt to verify the possible identity graphically

d) either prove the identity, or state a value for x that disproves the identity