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anonymous
 5 years ago
if in a triangle ABC, cosA.cosB+sinAsinBsinC=1, then the triangle is
a) right angled
b) equilateral
c)isosceles
d)none
anonymous
 5 years ago
if in a triangle ABC, cosA.cosB+sinAsinBsinC=1, then the triangle is a) right angled b) equilateral c)isosceles d)none

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0a) use A=B and C=90 u get (sinA)^2+(cosA)^2=1 which is an identity!

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0its not necessary that A should be equal to B right?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0that gives a 459045 triangle. i JUst tested a PARTICULAR case the answer should hold for all cases!!

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0k. then guessing wont work..

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you want to see the solution?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0why ask if u know the solution?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0because i dont understand them.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0why dont u use transformation formulae with the result A+B+C=180 that will give you the answer.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0okay i got that one cleared up...thanx

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0jus took out sinC from the relation.. that led to to the conclusion that A=B and finally C=90 the answer should be a its misprinted here i guess

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0well guess was right. It had to be right you know!!
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