Which statement is true for all real values of θ?

sin²θ − cos²θ = 1
cos²θ = 1 + sin²θ
sec²θ - tan²θ = 1
cot²θ = csc²θ +1

Question

Which statement is true for all real values of θ?

sin²θ − cos²θ = 1
cos²θ = 1 + sin²θ
sec²θ - tan²θ = 1
cot²θ = csc²θ +1

Narad · Answer

An identity is
$$\sin^{2}\theta + \cos^{2}\theta=1$$
Divide through out by $$\cos^{2} \theta $$
and you'll get the answer

kekeman · Answer

sin²θ − cos²θ = 1?
Which is the first option

jhonyy9 · Answer

how can you rewrite the 1 from the right part ?

jhonyy9 · Answer

above wrote for you @narad

kekeman · Answer

Idk i just guessed im very bad a this type of math

kekeman · Answer

@narad wrote:

An identity is $$\sin^{2}\theta + \cos^{2}\theta=1$$ Divide through out by $$\cos^{2} \theta $$ and you'll get the answer

cos²θ = 1 + sin²θ ?

jhonyy9 · Answer

@kekeman

kekeman · Answer

@narad wrote:

An identity is $$\sin^{2}\theta + \cos^{2}\theta=1$$ Divide through out by $$\cos^{2} \theta $$ and you'll get the answer

sec²θ - tan²θ = 1