​ please,  both the questions 10 and eleven, not one, and it's really urgent
​ please,  both the questions 10 and eleven, not one, and it's really urgent One or more than one correct : 10. In a triangle ABC if cosA + 2cosB + cosC = (A) tan Subjective : c — tan — = 3 2 c (C) cot— + cot — = 2cot— 2 2 2 then c (B) cot— cot — = 3 2 (D) sinA + sinc = 2sinB Find the sum of the squares of all the real solution of the equation 11.

Dear Student,
Please find below the solution to the asked query:

We havecosA+2cosB+cosC=2cosA+cosC=2-2cosBcosA+cosC=21-cosB2cosA+C2cosA-C2=21-1-2sin2B22cosπ-B2cosA-C2=21-1+2sin2B2  As A+B+C=π for triangle2cosπ2-B2cosA-C2=4sin2B2sinB2cosA-C2=2sin2B2cosA-C2=2sinB2cosA-C2=2sinπ-A+C2cosA-C2=2sinπ2-A+C2cosA-C2=2cosA+C2cosA-C2cosA+C2=2Apply Componando and DividendocosA-C2+cosA+C2cosA-C2-cosA+C2=2+12-1cosA-C2+cosA+C2cosA-C2-cosA+C2=32cosA2cosC22sinA2sinC2=32cosA2cosC22sinA2sinC2=3cotA2cotC2=3...iBy conditional identites in triangle we know thatcotA2+cotB2+cotC2=cotA2cotB2cotC2Use icotA2+cotB2+cotC2=3cotB2cotA2+cotC2=3cotB2-cotB2cotA2+cotC2=2cotB2

Hope this information will clear your doubts about this topic.

If you have any doubts just ask here on the ask and answer forum and our experts will try to help you out as soon as possible.
Regards

  • 0
What are you looking for?