railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
cos[(180° – θ)/2].cos[(180° – 9θ)/2] + sin[(180° – 3θ)/2].sin[(180° – 13θ)/2]ର ମୁଲ୍ୟ କଣ ?
1
sin2θ.sin4θ
2
cos2θ.cos6θ
3
sin2θ.sin6θ
4
cos2θ.cos4θ