Question

Sin a= 0,4, чему будет равен sin2a-?

Answer 1

Ответ:

ответ на фото

Объяснение:

Answer 2

To find the value of sin(2a) when sin(a) = 0.4, we can use trigonometric identities.

The double-angle formula for sine is:

sin(2a) = 2 * sin(a) * cos(a)

To find cos(a), we can use the Pythagorean identity:

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

Since sin(a) = 0.4, we can calculate cos(a):

cos^2(a) = 1 - sin^2(a) cos^2(a) = 1 - 0.4^2 cos^2(a) = 1 - 0.16 cos^2(a) = 0.84

Taking the square root of both sides:

cos(a) = √(0.84) ≈ 0.917

Now, we can find sin(2a):

sin(2a) = 2 * sin(a) * cos(a) sin(2a) = 2 * 0.4 * 0.917 sin(2a) = 0.7336

Therefore, sin(2a) is approximately equal to 0.7336.