Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

cos[(180° - θ)/2].cos[(180° - 9θ)/2] + sin[(180° - 3θ)/2].sin[(180° - 13θ)/2] విలువ ఎంత?

1
sin2θ.sin4θ
2
cos2θ.cos6θ
3
sin2θ.sin6θ
4
cos2θ.cos4θ

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