6. If 2 cos A = SinB then show that...
Question
Fullscreen

6. If 2 cos A = SinB then show that the triangle is isosceles. sin C

JEE/Engineering Exams
Maths
Solution
45
Rating
4.0 (1 ratings)
Fullscreen
[ begin{array}{l} 2 cos A=frac{sin B}{sin C} 2 sin C cos A=sin B sin (C+A)+sin (C-A)=sin A sin (180-A)+sin (B-c)=sin A sin A+sin (B-C)=8 pi A sin (B-C)=0 B-C=0 B=C end{array} ] hence 2 sider are equal it in incelen ( A ).
Quick and Stepwise Solutions Just click and Send Download App OVER 20 LAKH QUESTIONS ANSWERED Download App for Free