|
In een scherphoekige driehoek is één van de hoeken x°.
Een andere hoek meet 120° − x°. De cosinus van de derde hoek is dan gelijk aan |
A. \(\boldsymbol{\frac {1} {2} }\) |
|---|---|
| B. \(\boldsymbol{\frac {\sqrt 2} {2} }\) | |
| C. \(\boldsymbol{\frac {\sqrt 3} {2} }\) | |
| D. \(\boldsymbol{-\:\frac {\sqrt 3} {2} }\) | |
| E. \(\boldsymbol{-\:\frac 12 }\) |
[ 4-0751 - op net sinds 22.12.97-(E)-30.10.2023 ]
|
In an acute triangle, one of the angles measures x°.
Another angle measures 120° − x°. The third angle has a cosine of |
A. \(\boldsymbol{\frac {1} {2} }\) |
|---|---|
| B. \(\boldsymbol{\frac {\sqrt 2} {2} }\) | |
| C. \(\boldsymbol{\frac {\sqrt 3} {2} }\) | |
| D. \(\boldsymbol{-\:\frac {\sqrt 3} {2} }\) | |
| E. \(\boldsymbol{-\:\frac 12 }\) |
