cos2theta + sin^2theta =1

Question

anonymous · Answer

umm..yes, that is true
was that the question?

linda · Answer

yeah, i dont know how to solve it

anonymous · Answer

you dont solve it

its an identity lol

anonymous · Answer

it's a rule
you don't need to solve it. 
it's true

anonymous · Answer

or if you want a solution, then $$ \theta \in \mathbb{R} $$

anonymous · Answer

theta is any real number

anonymous · Answer

bit of a strange question , but yeh, thats probably what they were trying to get at , nevertheless and pretty bad question, the teacher wasnt thinking too hard when they made that

anonymous · Answer

elecengineer, take a look at michellej's question will you? 
trig id

anonymous · Answer

I know its an identity.

but it holds ( solves ) for all real thetas 

I am not an idiot :|

anonymous · Answer

????
i'm asking for help???
when did i call you an idiot.....
i'm asking if you would look at michellej's question caz i don't get it...