anonymous
  • anonymous
if in a triangle ABC, cosA.cosB+sinAsinBsinC=1, then the triangle is a) right angled b) equilateral c)isosceles d)none
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
a) use A=B and C=90 u get (sinA)^2+(cosA)^2=1 which is an identity!
anonymous
  • anonymous
its not necessary that A should be equal to B right?
anonymous
  • anonymous
the answer is d

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anonymous
  • anonymous
that gives a 45-90-45 triangle. i JUst tested a PARTICULAR case the answer should hold for all cases!!
anonymous
  • anonymous
k. then guessing wont work..
anonymous
  • anonymous
you want to see the solution?
anonymous
  • anonymous
yups...
anonymous
  • anonymous
why ask if u know the solution?
anonymous
  • anonymous
because i dont understand them.
anonymous
  • anonymous
why dont u use transformation formulae with the result A+B+C=180 that will give you the answer.
anonymous
  • anonymous
okay i got that one cleared up...thanx
anonymous
  • anonymous
how?
anonymous
  • anonymous
jus 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
  • anonymous
well guess was right. It had to be right you know!!

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