Question

Sin²20°+cos²160°= .........​

Answer 1

Ответ:

Отвечать:

0

Пошаговое объяснение:

sin² (180-160) + cos² (160) - tan² (45)

sin² (160) + cos² (160) - tan² (45)

1 - 1

= 0

Answer 2

Ответ:

Объяснение:

=sin^2 20 + cos^2 (180-20)=sin^2 20 + cos^2 20=1  (^ -знак степени)

Answer 3

1

This is because of the Pythagorean identity for trigonometric functions, which states that sin²(θ) + cos²(θ) = 1 for any angle θ. So when we substitute 20° and 160° for θ, we get:

sin²(20°) + cos²(20°) = 1 cos²(160°) + sin²(160°) = 1

Therefore, sin²(20°) + cos²(160°) = 1 as well.