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- Sep 3rd 2010, 04:47 AMaeroflixfind the value of sine theta
- Sep 3rd 2010, 04:49 AMmr fantastic
- Sep 3rd 2010, 04:55 AMaeroflix
i dont get it double angle.. i know half

- Sep 3rd 2010, 04:58 AMmr fantastic
- Sep 3rd 2010, 05:08 AMaeroflix
heres my best work... where did i went wrong?Attachment 18816

- Sep 3rd 2010, 05:15 AMmr fantastic
The question asked you to find $\displaystyle \sin \theta$, not solve for $\displaystyle \theta$. You have found $\displaystyle \sin^2 \theta = \frac{4}{13} \Rightarrow \sin \theta = \pm \sqrt{\frac{4}{13}}$. Your job is to decide which of the + or - solutins to keep.

- Sep 3rd 2010, 05:17 AMaeroflix
but in order to check if u have correct answer, if u try to substitute the theta value to the 1st given equation, it doesnt fit...

is there a problem ? - Sep 3rd 2010, 05:19 AMaeroflix
ok i got iot... i was correct.. its the positive side... so should the answer be 0.5546?

- Sep 3rd 2010, 05:23 AMmr fantastic