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If cos x+cosy=3/7 and cos x-cosy=5/9 prove that 27tan(x-y/2)+35cot(x+y/2)=0? |
| Answer» 7 and cosx-cosy=5/9 SHOW that 27tan(x-y)/2+35cot (x+y)/2=0 GET the ANSWERS y | |