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Trigonometry Transformations

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If A + B + C = 180° then cos A + cos B – cos C =

A. -1+4 sinA/2 sinB/2 sinC/2

B. -1+4 cosA/2 cosB/2 cosC/2

C. -1+4 cosA/2 cosB/2 sinC/2

D. -1+4 cosA/2 sinB/2 cosC/2

E. None of the above

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Correct choice: C

Explanation:

None

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Eamcet Mathematics Trigonometry Transformations

Eamcet Mathematics
Trigonometry Transformations