NationalHardTrigonometry10–12
If \sin x = \frac{1}{3} and x is in the second quadrant, what is \sin(2x)?
Se \sin x = \frac{1}{3} e x pertence ao segundo quadrante, qual é \sin(2x)?
Answer options
Solution
Step 1 of 3
- 1.From \sin^{2} x + \cos^{2} x = 1, \cos^{2} x = 1 - \frac{1}{9} = \frac{8}{9}.