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![[Post New]](/templates/default/images/icon_minipost_new.gif) 25 May 2007 19:06:13 IST
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hi.....here is the soln.
sin10 sin50 sin70 = sin10 sin(90-40) sin(90-20)
= sin10 cos40 cos20
mul 2cos10 in num. nd deno.....ull get.......
= sin20 cos20 cos40/2cos10
= sin40 cos40/4cos10
=sin80/8cos10
=sin(90-10)/8cos10
=1/8
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