Trig Identities and Half Angle Formulas

Question 1

1= what trig functions

Answer 1

cos^2(x) + sin^2(x)
sec^2(x) - tan^2(x)
csc^2(x) - cot^2(x)

Question 2

sin^2(x)=

Answer 2

(1/2)(1-cos(2x))

1-cos^2(x)

Question 3

cos^2(x)=

Answer 3

(1/2)(1+cos(2x))

1-sin^2(x)

Question 4

sinxcosx=

Answer 4

(1/2)(sin(2x))