## Search found 4 matches

Tue Apr 19, 2011 3:56 pm
Forum: Trigonometry
Topic: How to find answer of y = 0 using double angle formulas
Replies: 6
Views: 3567

### Re: How to find answer of y = 0 using double angle formulas

Thank you Martingale.
Tue Apr 19, 2011 2:33 am
Forum: Trigonometry
Topic: How to find answer of y = 0 using double angle formulas
Replies: 6
Views: 3567

### Re: How to find answer of y = 0 using double angle formulas

The only thing I need some instruction for this problem of cos2theta = 1 using polar to rectangular form. The result shown in the book is y = 0 but without any methods just the answer is useless. Thank you for your sympathies
Sun Apr 17, 2011 10:33 pm
Forum: Trigonometry
Topic: How to find answer of y = 0 using double angle formulas
Replies: 6
Views: 3567

### Re: How to find answer of y = 0 using double angle formulas

"Throw yo' hands up!?"
Attach yourself to this aspect of the equation if I did not mention it: The problem is asking to convert from polar to rectangular. Looking over my question I see I did not mention this part.
Sun Apr 17, 2011 1:39 pm
Forum: Trigonometry
Topic: How to find answer of y = 0 using double angle formulas
Replies: 6
Views: 3567

### How to find answer of y = 0 using double angle formulas

This equation cos2theta = 1, the closest equation using cos2theta double angle formula is the cos^2x - sin^2x version. But it is not exact. Can anyone show me the steps on how to complete the equation? The answer of 0 = 2y^2 is the nearest to y = 0 that I can solve without completing using dividing ...