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Do u knw cos rule?

yep...

good:) so vat is cosA?

b^2 + c^2 - a^2 / 2bc

cosB=?

a^2 +c^2 - b^2 / 2ac

good:)

2c^3 a^2 - 2a^4 c - 2c^3 b^2 + 2b^4 c = 0

u can factor out 2c.

2c ( b^4 - c^2 b^2 + a^2 c^2 - a^4) = 0
this right so far?

yup:) good:) nw divide by 2c both sides.

ok done that. btw im writing it down

ok:)

u will get this.
b^4 - c^2 b^2 + a^2 c^2 - a^4=0
try to factorise this.

(b^2 - a^2)(b^2 +a^2 -c^2)

(b+a)(b-a)(b^2+a^2 - c^2)

(b+a)(b-a)(b^2+a^2 - c^2)=0
Divide by (b+a)(b-a) both sides. vat do u get?

b^2 +a^2 - c^2 = 0

you can tell its right angle by looking at this.. but how do you tell if its isosceles?

u r nt asked to prove both right? either one of that?

oh i guess :)

i still think it means to prove that the triangle must be right or isoscles but it cant be scalene

but can we show it isoscles anyways?

let me think. hav to go nw. will be back in 15 mnts

ohh xDDDD THANKS!!
Shame i can only give medal to 1 person :(

hey, i am not here for medals ;)

Welcome:) you can give it to @gohangoku58

cos he/she deserves it most:)

:O
You made him solve the whole thing and i deserve it!??

lol

yup:) it was u who pointed out the isoscles one:)