## linda 5 years ago cos2theta + sin^2theta =1

1. anonymous

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

2. Linda

yeah, i dont know how to solve it

3. anonymous

you dont solve it its an identity lol

4. anonymous

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

5. anonymous

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

6. anonymous

theta is any real number

7. anonymous

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

8. anonymous

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

9. anonymous

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

10. anonymous

???? 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...