Question

sec2-x-sin2x-2sin4x-2cos4x-cos2x=1

Answer 1

To solve the equation above, one should find all the values of variable such as is the correct identity.

Graphically, the roots of some equation are the abscisses of the intersection points of function with axis :

Therefore, from the above plot of some function , we immediately can conclude that the values are the roots of equation .