3) Fill in the trigonometric functions for angles D and E in triangle DEF, where F is the right angle.

Решение:

Для треугольника DEF (угол F = 90°):

• sin D = \(\frac{EF}{DE}\)
• cos D = \(\frac{DF}{DE}\)
• tg D = \(\frac{EF}{DF}\)
• sin E = \(\frac{DF}{DE}\)
• cos E = \(\frac{EF}{DE}\)
• tg E = \(\frac{DF}{EF}\)

Ответ: