Trig Identities

Question 0

Integral Sec (X) dx

Answer 0

ln (Sec X +Tan X) + C

Question 1

Double Angle One

Answer 1

Sin(2x)=2•Sin(x)Cos(x)

Question 2

Double Angle Two

Answer 2

Cos(x)^2 - Sin(x)^2 = Cos(2x)

Question 3

Half Angle Formula

Answer 3

Sin(x)^2 = 1/2(1-Cos(2x))
Cos(x)^2 = 1/2(1+Cos(2x))

Question 4

Secret Tan Formula

Answer 4

2Tan(x)/(1-Tan(x)^2)

2x/(1-x^2) = Tan(2x)