Answer:
Step-by-step explanation:
So sin is defined as [tex]\frac{opposite}{hypotenuse}[/tex]. and cosine is defined as [tex]\frac{adjacent}{hypoteunse}[/tex]. So we need the adjacent side. Since we already have the opposite, and hypotenuse, you can use the Pythagorean identity to solve for the missing side: [tex]a^2+b^2 = c^2[/tex]
[tex]15^2 + b^2 = 19^2[/tex]
[tex]225 + b^2 = 361[/tex]
[tex]b^2 = 136[/tex]
[tex]b = \sqrt{136}[/tex]
[tex]b = \sqrt{4} * \sqrt{34}[/tex]
[tex]b = 2\sqrt{34}[/tex]
This is the adjacent side, so now plug this into the cosine equation and you get: [tex]\frac{2\sqrt{34}}{19}[/tex]
