if coty = [sin (z + x)]/[cos(z-x) - cos (z+x)]

then prove that cotx, coty, cotz, are AP.

my incomplete of soln-

just converted cot y = cosy/siny

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- May 29th 2011, 04:49 AMsaha.subhamProve that 2
if coty = [sin (z + x)]/[cos(z-x) - cos (z+x)]

then prove that cotx, coty, cotz, are AP.

my incomplete of soln-

just converted cot y = cosy/siny - May 29th 2011, 05:03 AMProve It
Try using

and

and see if you can simplify. - May 29th 2011, 06:06 AMsaha.subham