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| 1. |
prove that tan(x+y)/cot(x-y)=sin²x-sin²y/cos²x-sin²y |
| Answer» We have sin (x + y)cos (x -- y)/ cos (x + y)sin (x -- y)==> {2sin(x + y)cos(x -- y)}/{2cos(x + y)sin(x -- y)}==> { sin 2x + sin 2y}/{sin 2x --} | |