UPSC NDA Math Model Paper 2

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Question : 39 of 120

Marks: +1, -0

The simplified form of expression

cos‌4‌θ+i‌sin‌4‌θ

cos‌5‌θ+i‌sin‌5‌θ

can be written as −

(cos 4θ + i sin 5θ)
(cos θ + i sin θ)
(cos4 θ - i sin5θ)
(cos θ – i sin θ)

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