What is the value of cos [(180 – θ)/2] cos [(180 – 9θ)/2] + sin .........? (#SSCCGL Maths Questions)

Q53. What is the value of cos [(180 – θ)/2] cos [(180 – 9θ)/2] + sin [(180 – 3θ)/2] sin [(180 – 13θ)/2]?
[(180 – θ)/2] cos [(180 – 9θ)/2] + sin [(180 – 3θ)/2] sin [(180 – 13θ)/2] का मान क्या है ?
(a) sin 2θ sin 4θ (b) cos 2θ cos 6θ
(c) sin 2θ sin 6θ (d) cos 2θ cos 4θ
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SSC CGL TIER 2 2017
Exam Date: 17th February 2018
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