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NDA Math Trigonometric Ratios of Angles and Equations

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Question : 49 of 100
 
Marks: +1, -0
Consider the following for triangle ABC:
1. sin(‌‌
B+C
2
)=cos(‌‌
A
2
)
2. tan(‌‌
B+C
2
)=cot(‌‌
A
2
)
3. sin(B+C)=cosA
4. tan(B−C)=−cotA
Which of the above are correct?
[NDA I 2017]
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