3. 12 a
4. 7b-10
all you have to do is add up all of the sides.
Answer:
![sin(2\theta)=\frac{\sqrt{35} }{18}](https://tex.z-dn.net/?f=sin%282%5Ctheta%29%3D%5Cfrac%7B%5Csqrt%7B35%7D%20%7D%7B18%7D)
Step-by-step explanation:
Recall the formula for the sine of the double angle:
![sin(2\theta)=2*sin(\theta)*cos(\theta)](https://tex.z-dn.net/?f=sin%282%5Ctheta%29%3D2%2Asin%28%5Ctheta%29%2Acos%28%5Ctheta%29)
we know that
, and that
is in the interval between 0 and 90 degrees, where both the functions sine and cosine are non-negative numbers. Based on such, we can find using the Pythagorean trigonometric property that relates sine and cosine of the same angle, what
is:
![cos^2(\theta)+sin^2(\theta)=1\\sin^2(\theta)=1-cos^2(\theta)\\sin(\theta)=\sqrt{1-cos^2(\theta)} \\sin(\theta)=\sqrt{1-(\frac{3}{18} )^2}\\sin(\theta)=\sqrt{1-\frac{9}{324} }\\sin(\theta)=\sqrt{\frac{324-9}{324} }\\sin(\theta)=\sqrt{\frac{315}{324} }\\\\sin(\theta)=\frac{3}{18}\sqrt{35 }](https://tex.z-dn.net/?f=cos%5E2%28%5Ctheta%29%2Bsin%5E2%28%5Ctheta%29%3D1%5C%5Csin%5E2%28%5Ctheta%29%3D1-cos%5E2%28%5Ctheta%29%5C%5Csin%28%5Ctheta%29%3D%5Csqrt%7B1-cos%5E2%28%5Ctheta%29%7D%20%5C%5Csin%28%5Ctheta%29%3D%5Csqrt%7B1-%28%5Cfrac%7B3%7D%7B18%7D%20%29%5E2%7D%5C%5Csin%28%5Ctheta%29%3D%5Csqrt%7B1-%5Cfrac%7B9%7D%7B324%7D%20%7D%5C%5Csin%28%5Ctheta%29%3D%5Csqrt%7B%5Cfrac%7B324-9%7D%7B324%7D%20%7D%5C%5Csin%28%5Ctheta%29%3D%5Csqrt%7B%5Cfrac%7B315%7D%7B324%7D%20%7D%5C%5C%5C%5Csin%28%5Ctheta%29%3D%5Cfrac%7B3%7D%7B18%7D%5Csqrt%7B35%20%7D)
With this information, we can now complete the value of the sine of the double angle requested:
![sin(2\theta)=2*sin(\theta)*cos(\theta)\\sin(2\theta)=2*\frac{3}{18} \,\sqrt{35} \,\frac{3}{18}\\sin(2\theta)=\frac{2*3*3}{18*18}\,\sqrt{35} \\sin(2\theta)=\frac{\sqrt{35} }{18}](https://tex.z-dn.net/?f=sin%282%5Ctheta%29%3D2%2Asin%28%5Ctheta%29%2Acos%28%5Ctheta%29%5C%5Csin%282%5Ctheta%29%3D2%2A%5Cfrac%7B3%7D%7B18%7D%20%5C%2C%5Csqrt%7B35%7D%20%5C%2C%5Cfrac%7B3%7D%7B18%7D%5C%5Csin%282%5Ctheta%29%3D%5Cfrac%7B2%2A3%2A3%7D%7B18%2A18%7D%5C%2C%5Csqrt%7B35%7D%20%5C%5Csin%282%5Ctheta%29%3D%5Cfrac%7B%5Csqrt%7B35%7D%20%7D%7B18%7D)
Answer:
10.10
Step-by-step explanation:
A true or false question is a question that gives you a statement, and asks whether it's true (correct) or false (wrong).