jee-main 2012 Q67

jee-main · India · 26may Addition & Double Angle Formulae Simplification of Trigonometric Expressions with Specific Angles
The value of $\cos 255 ^ { \circ } + \sin 195 ^ { \circ }$ is
(1) $\frac { \sqrt { 3 } - 1 } { 2 \sqrt { 2 } }$
(2) $\frac { \sqrt { 3 } - 1 } { \sqrt { 2 } }$
(3) $- \frac { \sqrt { 3 } - 1 } { \sqrt { 2 } }$
(4) $\frac { \sqrt { 3 } + 1 } { \sqrt { 2 } }$ 
The value of $\cos 255 ^ { \circ } + \sin 195 ^ { \circ }$ is\\
(1) $\frac { \sqrt { 3 } - 1 } { 2 \sqrt { 2 } }$\\
(2) $\frac { \sqrt { 3 } - 1 } { \sqrt { 2 } }$\\
(3) $- \frac { \sqrt { 3 } - 1 } { \sqrt { 2 } }$\\
(4) $\frac { \sqrt { 3 } + 1 } { \sqrt { 2 } }$
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