1.

If cosB = (sinA)/(2sinC) prove that the triangle is isosceles.

Answer»

SOLUTION :If cosB = (SINA)/(2sinC)
`rArr (c^2+ a^2-b^2)/(2ca) = a/92c) rArr c^2 + a^2 - b^2 = a^2`
or,` c^2 = b^2 PR c = b`
`therefore` the TRIANGLE is ISOSCELES.


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