Trig Identities

Front

Get cos²θ alone: sin²θ + cos²θ = 1

Back

cos²θ = 1 - sin²θ

Front

secθ = ?

Back

1/cosθ

Front

cscθ = ?

Back

1/sinθ

Front

Which of the following is an incorrect identity? sin²x + cos²x = 1, tan(x) = sin(x)/cos(x), cot(x) = cos(x)/sin(x), 1 + cot²x = sec²x

Back

1 + cot²x = sec²x

Front

cotθ = ?

Back

cosθ/sinθ

Front

What is the Pythagorean identity?

Back

sin²θ + cos²θ = 1

Front

What is the definition of tanθ?

Back

tanθ = sinθ/cosθ

Front

What is the relationship between secθ and cosθ?

Back

secθ = 1/cosθ

Front

What is the relationship between cscθ and sinθ?

Back

cscθ = 1/sinθ

Front

What is the definition of cotangent?

Back

cotθ = 1/tanθ