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if the angles A ,B ,C of a triangle are in AP and if a,b,c denotes the lenght of the side opposite to A, B , C respectively then the value of the expression a/c *sin2C + C/a * Sin2A is ?
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hartnn
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A+B+C=180
A+C=2B
B=.... ?
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B=60
shubhamsrg
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how about hit and trial..
assume the angles are 60,60,60
so final ans becomes sqrt3 ! :P
please confirm..
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Yes..)
Yahoo!
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but i did nt get u..)
hartnn
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from sine rule, c/a =... ?
then c/a *(2sin A cos A )= .. ?
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Ha...Silly...i got it..:)
hartnn
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wasn't it easy ? ;)
RadEn
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what means AP ?
hartnn
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Arithmetic Progression
if, a,b,c are in AP, then
2b=a+c
RadEn
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actually, if a,b,c in AP then the triangle have sides 3x, 4x, 5x. it means the right triangle. right ?
hartnn
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how did u come up with sides 3x, 4x, 5x ?
and angels are in AP, not sides....
RadEn
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OPSS... i look ur coment before hartnn :)