Question

Arătaţi că sin135° cos 45° =1​

Answer 1

Răspuns:

½

Explicație pas cu pas:

$\sin(135\degree) \cos(45\degree) = \frac{ \sin(135\degree + 45\degree) + \sin(135\degree - 45\degree)}{2} =$

$= \frac{ \sin(180\degree) + \sin(90\degree)}{2} = \frac{0 + 1}{2} = \bf \frac{1}{2}$