Prove the following
1-tanA/1+tanA

Which expression is equivalent to 2x^2+7x+4?

Brian, chris, and damien took a math test that had 20 questions. the number of questions brian got right is 14 more than the number of questions chris got right. damien correctly answered 2 less than the number of questions chris answered correctly. if brian and damien have the same score, which statement is true?

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!