Question Number 79856 by Pratah last updated on 28/Jan/20
Commented by Pratah last updated on 28/Jan/20
$$\mathrm{proof}\:\mathrm{of}\:\mathrm{identity} \\ $$
Commented by mr W last updated on 28/Jan/20
$${where}\:{did}\:{you}\:{get}\:{this}\:{question}? \\ $$$${it}'{s}\:{wrong}.\:{you}\:{can}\:{check}\:{with}\:{a} \\ $$$${calculator}. \\ $$