railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Trigonometry Circular Measure of Angles
Using cos(A + B) = cos A cos B - sin A sin B, find the value of cos75°.
1
\(\frac{\sqrt5-1}{4}\)
2
\(\frac{\sqrt5+1}{4}\)
3
\(\frac{\sqrt6-\sqrt2}{4}\)
4
\(\frac{\sqrt6+\sqrt2}{4}\)