Trig Identities

Question 1

What trig identity involves tan x, sin x and cos x ?

Answer 1

tan x = sin x /cos x

Question 2

What trig identity involves sin^2 x and cos^2 x?

Answer 2

sin^2 x + cos^2 x = 1

Question 3

What trig identity involves tan^2x and sec^2x ?

Answer 3

1 + tan^2x = sec^2x

Question 4

What trig identity involves cot^2x and cosec^2x ?

Answer 4

1 + cot^2x = cosec^2x

Question 5

What are all of the trig identities you need to know?

Answer 5

tan x = sin x /cos x
sin^2 x + cos^2 x = 1
1 + tan^2x = sec^2x
1 + cot^2x = cosec^2x