I NEED EVERY BODIES HELP ASAP the question is 15.6/-3

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).