Question

The value of $\cos {105}^o$+$\sin {105}^o$ is ?

• A. $\frac{1}{2}$
• B. $1$
• C. $\sqrt{2}$
• D. $\frac{1}{\sqrt{2}}$

Answer 1

Answer: (D)

$\frac{1}{\sqrt{2}}$

$=cos{105}^o$+$\sin {105}^o$

$=(-0.25881904+0.9659258)$
$=\mathrm{0.70710678.}$
$=\frac{1}{\sqrt{2}}$