MCQOPTIONS
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MCQOPTIONS
| 1. |
If cos 47° + sin 47° = k, then what is the value of cos2 47° - sin2 47°? |
| A. | \(k\sqrt {2 - {k^2}}\) |
| B. | \(-k\sqrt {2 - {k^2}}\) |
| C. | \(k\sqrt {1 - {k^2}}\) |
| D. | \(-k\sqrt {1 - {k^2}}\) |
| Answer» B. \(-k\sqrt {2 - {k^2}}\) | |