Question

1+cos2β, если cosβ=0,4.

Answer 1

Ответ:

1+0,4*2=1,8

Объяснение:

Answer 2

Given that cosβ = 0.4, you can substitute this value into the expression and calculate:

1 + cos(2β) = 1 + cos^2(β) - sin^2(β)

Since cosβ = 0.4, you know that sinβ = √(1 - cos^2(β)) = √(1 - 0.4^2) ≈ 0.9165.

Now, plug in the values:

1 + cos(2β) = 1 + cos^2(β) - sin^2(β) = 1 + 0.4^2 - 0.9165^2 = 1 + 0.16 - 0.8411 = 0.3189

So, when cosβ = 0.4, the value of 1 + cos(2β) is approximately 0.3189.