Question

Cosa, если sina=1/9 , 0

Answer 1

Если я все правильно поняла, то вот так

Answer 2

По основному тригонометрическому тождеству: sin²+cos²=1 ⇒
cos²=1-(1\9)²
cos=√1-1\81
cos=√80\√81
cos=√80\9
если sin=0, то cos=√1-0
cos=√1=1

Answer 3

It seems there might be some confusion in the question. "Cosa" is not a recognized mathematical term or operation. However, I can help you with the part related to trigonometry.

In the question, you have provided two values for the sine of an angle (sina = 1/9 and 0). The sine function (sin) is a trigonometric function that relates the angle of a right triangle to the ratio of the length of the side opposite the angle to the length of the hypotenuse.

1. sina = 1/9: This means the sine of some angle (let's call it angle A) is equal to 1/9. Mathematically, we can write it as:

   sin(A) = 1/9

2. sina = 0: This means the sine of some angle (let's call it angle B) is equal to 0. Mathematically, we can write it as:

   sin(B) = 0

To find the specific values of angles A and B, we can use trigonometric tables or a calculator. However, without further context or information, we cannot determine the exact values of these angles. Please provide additional information or clarify your question, and I'll be happy to assist you further.