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Dipankar Sadhukhan

Created: Mar 2, 2024, 2:33 PMUpdated: Mar 2, 2024, 2:43 PM

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Q. cos(180°−A)+cos(180°+B)+cos(180°+C)−sin(90°+D)

⇒cos(22π−A)+cos(22π+B)+cos(22π+C)−sin(2π+D)

→−cosA−cosB−cosC−cosD