\sinA+2\sin2A+\sin3A is equal to which of the following? 1. 4\sin2A\cos^{2}( \frac{A}{2}) 2. 2\sin2A(\sin \frac{A}{2}+\cos \frac{A}{2})^{2} 3. 8\sinA\cosA\cos^{2}( \frac{A}{2}) Select the correct answer using the code given below: [NDA II 2016]

Correct Answer is : 1 and 3 only

UPSC NDA 2 2016 Mathematics Solved Paper

Question : 41 of 120

Marks: +1, -0

sinA+2‌sin‌2‌A+sin‌3‌A is equal to which of the following?
1. 4‌sin‌2‌A‌cos2(‌‌

)
2. 2‌sin‌2‌A(sin‌‌

+cos‌‌

)2
3. 8‌sinA‌cosA‌cos2(‌‌

)
Select the correct answer using the code given below:

[NDA II 2016]

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