UPSC NDA I 2010 Mathematics Paper

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Question : 93 of 120

Marks: +1, -0

If angles A,B,C are in AP, then what is sin‌A+2‌sin‌B+sin‌C equal to?

4‌sin‌B‌cos2(‌
A−C
2
)
4‌sin‌B‌cos2(‌
A−C
4
)
4‌sin(2B)‌cos2(‌
A−C
2
)
4‌sin(2B)‌cos2(‌
A−C
4
)

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