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Grade:
        

In a triangle triangle ABC  if  cos C=sinA/2sinB,prove that the triangle is isosceles.

7 years ago

Answers : (2)

Sunil Raikwar
askIITians Faculty
45 Points
							2sinBcosC=sinA
sin(B+C)+sin(B-C)=sinA
sin(180-A)+sin(B-C)=sinA
sinA+sin(B-C)=sinA
sin(B-C)=0
B-C=0
B=C
Thanks & Regards
Sunil Raikwar
askIITians faculty
5 years ago
Manas Satish Bedmutha
22 Points
							
						
5 years ago
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