Question

cosαtgα/sin^2α допоможіть

Answer 1

$tga = \frac{sina}{cosa}$ ⇒ $\frac{cosa*tga}{sin^{2}a } = \frac{cosa*sina}{cosa*sin^{2}a} = \frac{sina}{sin^{2}a} = \frac{1}{sina}$

Ответ: cosαtgα/sin^2α = 1/sina