Assume there exist the following relation in triangle ABC: sinB= 2sinC.cosA
a) Prove That we also have the relation b = 2c.cosA .
My Work : Form the first relation I've just got the cosA and then replaced it in the second relation , But I think I've gone no where :!:
b) Deduce that the triangle is isosceles .
My Work: To prove a triangle is isosceles : the base angles should be equal or the two sides adjacent to the vertex must be equal :!:
Please I don't need answers I just need some hints or clarification .
Thank you
a) Prove That we also have the relation b = 2c.cosA .
My Work : Form the first relation I've just got the cosA and then replaced it in the second relation , But I think I've gone no where :!:
b) Deduce that the triangle is isosceles .
My Work: To prove a triangle is isosceles : the base angles should be equal or the two sides adjacent to the vertex must be equal :!:
Please I don't need answers I just need some hints or clarification .
Thank you