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

kekeman · Answer

I think its "cos²θ = 1 + sin²θ"

jhonyy9 · Answer

@kekeman wrote:

I think its "cos²θ = 1 + sin²θ"

why just you think it so ? than you dont believe it ,try prove it

jhonyy9 · Answer

hope you know the basic formula of trigonomatry

sin²θ  +cos²θ = 1

jhonyy9 · Answer

kekeman · Answer

@surjithayer

kekeman · Answer

No I change my mind I think its C.)

surjithayer · Answer

Jhony 9 is correct.
c is correct.

kekeman · Answer

So how do I come up with that answer because I am confused about it