Question

Use the given special right triangle to find the value of cos 7 21 XV3 3 T

Answer 1

We have:

`\cos ((\pi)/(6))=\frac{\sqrt[]{3}}{2}`

And

`\cos ((\pi)/(3))=(1)/(2)`

After that, we proceed as follows:

`\sin ((\pi)/(3))=\frac{x\sqrt[]{3}}{2x}\Rightarrow\sin ((\pi)/(3))=\frac{\sqrt[]{3}}{2}`
`\cos ((\pi)/(3))=(x)/(2x)\Rightarrow\cos ((\pi)/(3))=(1)/(2)`