Question

Помогите решить
$frac{(sin alpha + cos alpha ) {}^{2} }{1 + 2sin alpha times cos alpha } = 1$

Answer 1

$frac{(sin alpha + cos alpha ) {}^{2} }{1 + 2sinalphatimes cos alpha } = frac{sin^2 alpha +2sinalphatimes cosalpha+ cos^2 alpha}{1 + 2sinalpha times cos alpha} = frac{1+2sinalphatimes cosalpha}{1 + 2sin alpha times cos alpha} =1$