Taylor Series (centered at a)
Taylor Series (centered at 0)
cos 2(x) ⇠⇢ sin 2 (x)
1 - sin 2 (x) = cos 2(x)
1 - cos 2(x) = sin 2 (x)
Half Angle Formulas
sec 2(x) ⇠⇢ tan 2 (x)
sec 2(x) = 1 + tan 2 (x)
tan 2 (x) = sec 2(x) - 1
sin (2x) Identity
sin (2x) = 2sin (x) cos (x)