Question

The terminal side of 0 is in quadrant IV and sin0 =

Answer 1

Using Pythagorean theorem, it follows

`\begin{gathered} x^2+12^2=13^2 \\ x^2=13^2-12^2 \\ x^2=169-144 \\ x^2=25 \\ x=5 \end{gathered}`

Using the cosine rule it follows:

`\cos\theta=(5)/(13)`