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UPSC NDA I and II 2020 Math Solved Paper

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Question : 40

Total: 120

What issin‌3‌x+cos‌3‌x+4sin3x −3‌sin‌x+3‌cos‌x−4cos3x equal to ?

0
1
2‌sin‌2‌x
4‌cos‌4‌x

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