Sin2a/sina ; sin2a/2cosa ;sin2a/cos^2a-sin^2a ;

Question

Sin2a/sina ; sin2a/2cosa ;sin2a/cos^2a-sin^2a ;

Answer 1

Sin2a/sina = 2.sina.cosa /sina =2.cosa
sin2a/cosˇ2a - sinˇ2a = sin2a/cos2a = tg 2a