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## aussy123 Group Title How do I solve this problem? Solve for cosθ in sin^2θ + cos^2θ = 1 one year ago one year ago

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1. terenzreignz Group Title

This? $\large \sin^2\theta+\cos^2\theta=1$

2. aussy123 Group Title

yes

3. terenzreignz Group Title

Well, let's see... How to break this to you... cosθ can literally be any value from [-1 , 1] Let me explain... the value of cosθ depends on the value of θ, right?

4. aussy123 Group Title

yes

5. terenzreignz Group Title

Well, unfortunately (fortunately?) ANY value of θ would make this statement true sin²θ + cos²θ = 1

6. hartnn Group Title

he/she needs to solve for cos so, subtract sin^2 term from both sides, what u get ?

7. terenzreignz Group Title

Oops... Must have been overexcited :) My bad

8. aussy123 Group Title

Im trying to write it but its giving me a hard time

9. aussy123 Group Title

±√(1 + sin2Θ)

10. hartnn Group Title

did you mean $$\pm \sqrt{1-\sin^2 \theta}$$ ??

11. aussy123 Group Title

yes I pasted the wrong one Sorry, my computer is acting really crazy today

12. hartnn Group Title

ohh..if you meant that, then you are correct.

13. aussy123 Group Title

ok thanks you made this very easy, thank you.. :)

14. hartnn Group Title

glad to hear :) welcome ^_^