railway RRB Group D Mock Test Series 2024-25 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
Evaluate the following:
cos(36° + A).cos(36° - A) + cos(54° + A).cos(54° - A)
1
sin 2A
2
cos A
3
sin A
4
cos 2A
Evaluate the following:
cos(36° + A).cos(36° - A) + cos(54° + A).cos(54° - A)