Double-Angle Formulas
Double-Angle Formulas:
sin 2a = 2 sin a cos a
cos 2a = cos2 a - sin2 a
= 1 - 2sin2 a
= 2cos2 a - 1
tan 2a = (2tan a) / (1-tan2 a)
Subject:
Trigonometry [1]
Subject X2:
Trigonometry [1]