Question

Найдите Sina и tga если cisa=0.8

Answer 1

cosa = 0.8

sin²a+cos²a =1

sina=√1-cos²a =√1-0,64=√0,36=0,6

tga=sina/соsa=0,6/0,8=6/8=3/4=0,75

Answer 2

To find the values of sine (sin) and tangent (tan) of an angle, we need to know the value of the angle itself. The given information "cisa = 0.8" seems to contain a typographical error. I assume you meant "sin(a) = 0.8."

If sin(a) = 0.8, we can find the value of the cosine (cos(a)) using the Pythagorean identity:

cos^2(a) + sin^2(a) = 1

Since sin(a) = 0.8, we can solve for cos(a):

cos^2(a) + 0.8^2 = 1 cos^2(a) + 0.64 = 1 cos^2(a) = 1 - 0.64 cos^2(a) = 0.36 cos(a) = sqrt(0.36) cos(a) = 0.6

Now that we have the values of sin(a) and cos(a), we can find the value of tan(a) using the identity:

tan(a) = sin(a) / cos(a) tan(a) = 0.8 / 0.6 tan(a) = 4/3 ≈ 1.3333

So, when sin(a) = 0.8, the value of cos(a) is 0.6, and the value of tan(a) is approximately 1.3333.