|
De getalwaarde van
cos2α + cos 2α + 2 cosα voor α = 45°, is |
A. \(\large\boldsymbol{\frac {\sqrt 2\,+\,1} {2} }\) |
|---|---|
| B. \(\boldsymbol{2\sqrt 2 +\frac 12 }\) | |
| C. \(\boldsymbol{\sqrt 2 + \frac 32}\) | |
| D. \(\boldsymbol{\sqrt 2 + \frac 12}\) | |
| E. \(\boldsymbol{\text{een rationaal getal} }\) |
[ 4-2657 - op net sinds 8.10.12-(E)-30.10.2023 ]
|
The value of cos2α + cos 2α + 2cosα for α = 45° is |
A. \(\large\boldsymbol{\frac {\sqrt 2\,+\,1} {2} }\) |
|---|---|
| B. \(\boldsymbol{2\sqrt 2 +\frac 12 }\) | |
| C. \(\boldsymbol{\sqrt 2 + \frac 32}\) | |
| D. \(\boldsymbol{\sqrt 2 + \frac 12}\) | |
| E. \(\boldsymbol{\text{a rational number} }\) |