UPSC NDA Math Model Paper 6

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Question : 39 of 120

Marks: +1, -0

sin‌7‌x+6‌sin‌5‌x+17‌sin‌3‌x+12‌sin‌x

sin‌6‌x+5‌sin‌4‌x+12‌sin‌2‌x

equals:

sin x
2 sin x
cos x
2 cos x

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