AP EAMCET · Maths · Properties of Triangles
In a triangle , if
- A
- B
- C
- D
Answer & Solution
Correct Answer
(A)
Step-by-step Solution
Detailed explanation
Given, Triangle ABC, To find the value of acosA-bcosBacosB-bcosA+cosC Using the sine rule we get, =2RsinAcosA-2RsinBcosB2RsinAcosB-2RsinBcosA+cosC =sin2A-sin2B2sinAcosB-sinBcosA+cosC =2sinA-BcosA+B2sinA-B+cosC =cosA+B+cosC =-cosC+cosC as A+B=π-C =0
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