JEE MATHEMATICS MCQ: TRIGONOMETRY RATIOS

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Understanding +4 | -1

\cos \,\,1^\circ + \cos \,\,2^\circ + \cos \,\,3^\circ + ... + \cos \,\,180^\circ

is equal to

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Correct option: D

- 1

Option D (-1) is correct because the sum telescopes due to the symmetry of cosine around 90 degrees, with cos(180) being -1.

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