How to prove the identity `sin^2x + cos^2x = 1` ? - Homework Help - eNotes.com
Math Homework Help. Question: How to prove the identity `sin^2x + cos^2x = 1` ?, Topics: Math, Tags: angles, cosine, Math, sine, Trigonometry ... This is not a proof, but it sure is compelling evidence: Enter y=(sin(x))^2+(cos(x))^2 into a graphing calcul...