AP EAMCET · Maths · Trigonometric Equations
If \(\cos A+\cos B+\cos C=0=\sin A+\sin B+\sin C\), then \(\cos (A-B)=\)
- A \(0\)
- B \(\frac{1}{2}\)
- C \(-\frac{2}{3}\)
- D \(-\frac{1}{2}\)
Answer & Solution
Correct Answer
(D) \(-\frac{1}{2}\)
Step-by-step Solution
Detailed explanation
Given \(\cos A+\cos B+\cos C=0=\sin A+\sin B+\sin C\) ...(i) Now \(\cos A+\cos B+\cos C=0\)…
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